Coincident Speaker authorized dealers


Coincident Turbo 845SE Mono Amplifiers

25th Anniversary Limited Edition


Coincident is thrilled to introduce a special, once in a lifetime audio component of unparalleled design, build quality and sonic performance. The Turbo 845SE - 25th Anniversary Limited Edition Amplifier is a celebration of the 25 years since Coincident was established. The Turbo 845SE is the culmination of more than 2 decades of painstaking research and development into all amplifier technologies and modes of operation. The goal - create the most transparent amplifier whose flaws are so negligible as to be essentially indiscernible and simultaneously be capable of driving virtually all high performing speakers. The result was single ended operation, using directly heated triode tubes- maximizing harmonic completeness, revelation of low level detail- coupled with power delivery that would not compromise real world dynamics, low bass extension nor diminish the impact, weight and authority experienced in a live music environment. These amplifiers were created with absolutely no holds barred, to be state of the art with no regard to cost. The Turbo 845SE Monos represent a breakthrough in amplifier performance. The Turbo 845SE Monos, remarkably, as all Coincident components, also represent the finest value in all of high end audio.

The Turbo Monos will be a limited edition restricted to the sale of 25 pairs. Once they are gone, there will not be any further offered for sale. They are destined to become a collector’s classic.

  • High gauge stainless steel, mirror finish chassis that is non magnetic, extremely rigid and non resonant
  • Dual power transformers per amp- High voltage and Low Voltage Filament- to ensure low noise, cool operation and unlimited power reserves
  • The finest Ohno copper interstage (no coupling capacitor), output and dual power transformers
  • Tube compliment- 6EM7 super tube for input- So much current capability it has its own power supply
  • 300B Driver Tube for utmost purity ( no pentode tubes used in this DHT design)
  • 845 Shuguang Psvane output tube in single ended configuration
  • Only Teflon caps used in cathode bias circuit
  • Massive power supply- caps are all 1500V polypropylenes- no electrolytics- Joule rating - 975- exceeds those in 600 watt RMS tube amplifiers - Provides tremendous peak power capability
  • 28 watts RMS sounds like 100 watts due to extra large energy reserves
  • Binding posts are Coincident Ohno copper, .25" solid post
  • Ultra High precision auto bias circuit maintains optimum bias as tubes age
  • All resisters are 1% tolerance and none less than 2 watts
  • All meticulously hard wired using the breakthrough Coincident Statement cable

Due to the impeccable hand crafting, finest state of the art components, and massive power supply energy storage, (975 Joules), the Turbo Monos are not only the most accurate, transparent, harmonically complete, and full range SET tube amplifiers, they are fully capable of driving virtually any speakers of 84 db sensitivity or more to concert hall levels with ease. While rated at 28 watts RMS, peak levels of 100 watts is available with virtually no distortion or compression.


Output Power: 28 watts RMS - 100 watts peak- Class A-
Energy Storage: 975 Joules
Output Impedance: 8 ohm
Frequency Response: 20hz-20khz ±1db
T.H.D.: <1%, 20hz-20khz (Ref. Output)
Input Sensitivity: 700 mv for full output
Input Impedance: 100k ohms
S/N: >90db
Tubes: (6EM7 ×1, 300B ×1, 845 x1) / Channel
Power Requirement: AC 115v or 230V 50/60hz (User selectable on back panel)
Dimension: 12 “ W x 21 “ D x 10 “ H
Gross Weight: 110 lbs - 41 Kgs
Net Weight: 98lbs- 44.5 Kgs
Price: $14,999 US /pair

Turbo 845SE Mono Amplifiers Turbo 845SE Mono Amplifiers Turbo 845SE Mono Amplifiers Turbo 845SE Mono Amplifiers
Turbo 845SE Mono Amplifiers
845SE Mono Diagram


As of Jan.15/19, Coincident is excited to introduce the MK.III version of the Frankensteins. Improvements include:

- Separate HT fuse which protects the amplifier in case of 300B tube failure
- Enlarged power supply capacity- deeper, more impactful bass
- Improved voltage regulation- immune to AC voltage fluctuations
- Improved resistors and capacitors which results in greater revelation of low level detail and airier, more extended high frequencies
- Coincident Statement internal wiring which enhances purity and transparency.
- Upgraded output transformers with a flat frequency response from 10 hz- 30khz.

The Frankenstein MK III are even more transparent, with extended frequency range, enhanced dynamics, punchier, tighter bass and are absolutely dead silent.Perfect match with ultra high sensitivity speakers ( 100db or higher) due to the total absence of residual noise.

The M300B Frankenstein MK III mono amplifiers are now in stock. Built to the absolute highest standard -

-Triangular chassis constructed from high gauge stainless steel -mirror polished finish- maximum non resonant, highest rigidity and non magnetic
-All hardwired with Coincident Statement cable
-The finest 6N copper interstage (no coupling capacitor), output and power transformers
-Finest Teflon caps
-Massive all polyproylene power supply- no electrolytics
-Precise Auto biasing which maintains optimum operating bias as tubes age
-3 tube configuration (6EM7 input driver, 300B output, 5U4GB rectifier) for purest sonics
-Input and rectifier tubes are the best NOS American. Comes standard with the finest quality, tested and matched Psvane 300B tubes. Others available at special discount pricing

These amps represent a sonic breakthrough. Their transparency and absence of an electronic sound set new standards. Mated to the appropriate speakers, they will prove to be a revelation. They easily drive every Coincident speaker model.

MK III Specifications-

Output Power: 8 watts RMS -(Triode) / SE Class A
Output Impedance: 8 ohms- Optimized for 8-16 ohms.
Frequency Response: 10hz - 20khz ±1db
T.H.D.: <1%, 20hz-20khz (Ref. Output)
Input Sensitivity: 700mv
Input Impedance: 100k ohm
S/N: >90db
Tubes: (6EM7×1, 300B ×1, 5U4GB ×1) / Channel
Power Requirement: AC 115v Or 230V - 50/60hz (User selectable on back panel)
Dimension: 15" W x 12" D x 8.5 "H
Gross Weight: 19 Kgs- 41.8 lbs.
Net Weight: 17.5 Kgs - 38.5 lbs.
Price - $6499 US /pair

2018 Positive Feedback Writers' Choice Award

2018 Positive Feedback Writers' Choice Award

Dynamo Mk II Amplifier

2018 Positive Feedback Writers' Choice Award

Coincident Dynamo 34SE MKII SET Amplifier

The first hint that I wasn't getting the best out of the 12 Ohm, 93dB efficient Triode Masters was when I replaced my 80-150-wpc solid-state amps with the amazing 8-wpc Coincident Dynamo 34SE MkII SET amp. I can't officially give the Dynamo an award as I didn't review it, just purchased it based on a friend's raves. Adding the Statement power cord on Coincident honcho Israel Blume's recommendation upped the performance so markedly I bought another cord for the Oppo 205. Which led me to buy one of their interconnects, each cable easily bettering what I had carefully and happily matched to the solid state amp/metal driver speakers in my previous rooms.

Read the full article here.

2018 Positive Feedback Writers' Choice Award

Dynamo Mk II

High-End Audio Buyer's Guide Award

Coincident Dynamo MK II Amplifier

Statement Mk II Line Stage -

As of Sept.15/18, Coincident is introducing the new and improved MK.II version of the world renowned and award winning Statement Line Stage. The improvements include:

- Upgraded volume potentiometers;

- Improved volume transformers;

- Higher energy storage power supply capacitors;

- Coincident Statement internal wiring.

The result is bullet proof reliability coupled with enhanced transparency, dynamic gradations and greater low level detail retrieval. New Price : $5999 US. ( the first price increase since the Statement was introduced 10 years ago. )

Read the full article here.

Coincident Speaker Technology

Dynamo 34SE MK II Power Amplifier

Little Amp, Big Sound

By Dick Olsher, The Absolute Sound

Since my initial review of the Dynamo 34SE in 2015, the amp has undergone several significant revisions. On balance, the Mk. II version of this low-cost SET amp ($1495, 8Wpc) should be thought of as nothing less than a Dynamo on steroids. For starters, it has put on some weight, tipping the scales at 30 pounds, an eight-pound increase from the original, due mostly to the beefed-up power transformer. The chassis has been upsized and properly braced to reduce resonances. The 5U4G rectifier is gone, replaced by a 5AR4, which by virtue of its indirectly heated filament provides for a gentle high-voltage start up. This is a good thing, and I'm happy to report that, unlike my experience with the 5U4G, the 5AR4 worked flawlessly. Power supply filter capacity has been increased by 70% and capacitor voltage ratings have been doubled for increased reliability. you get all this for only a $200 increase in retail price- now that's something worth writing about.

Read the full review here.

April 2018

Passive Versus Active Preamplifiers

Article By Israel Blume
President, Coincident Speaker Technology

Coincident Speaker Technology Dynamite Floorstanding Speaker review by

Passive Preamplifier

In essence is merely a volume control designed to attenuate the signal going from the source (usually a CD player) to the amplifier. Since it is passive, it has no inherent gain because it has no active components (tubes or transistors) in the signal path. The quality (sonic purity) will be largely dependent on the volume potentiometer used. The finest discrete resistor pots will sound more accurate than a variable one, for example, since the signal travels through only one resistor at any given setting and is therefore not dependent on volume position as is the case with a variable pot. Many believe that transformer volume controls can be superior to even the best discrete resistor pots, since the TVC is inherently passive while the latter still requires the audio signal to traverse a resistor. The TVC is more costly to properly implement since the best transformers are very expensive.

Read the full article here.

2018 TAS Editors' Choice Awards

Coincident M300B Frankenstein MKII Amplifiers
Editors Choice
The Absolute Sound
2018 TAS Editors' Choice Awards
Dynamo Mk II
Editors Choice
The Absolute Sound
2018 TAS Editors' Choice Awards



Coincident Dynamite Speakers

Review By Mark Marcantonio

Coincident Speaker Technology Dynamite Floorstanding Speaker review by TONEAudio

New ideas. It’s what keeps the audio world fresh and interesting to hobbyists, not to mention various forum threads entertaining. With speakers, due to the limited parts, new designs are few and far between. Fortunately, I’ve been able to spend time listening to a truly unique cabinet design, the Coincident Dynamite.

In audio circles, Coincident founder Israel Blume is known to be driven, to say the least when it comes to cabinet design. Standing waves and resonances are his enemy. Over the years, each of his designs have attacked and cornered the duel evils based on his patented approach. The resonances are tuned to a neutral 350hz, whereby physics kicks in and the heat created is dissipated. For the listener, it boils down to music free of artificial frequencies.

To deny those pesky axial, tangential, and oblique standing waves some serious engineering design is needed. In accomplishing this, Blume earned a patent for “asymmetrical wall enclosure”. Putting it simply, its way more involved than just using MDF and attaching a few braces. It requires eliminating out of phase waves, a skill akin to threading the needle while off road driving in the Rockies.

Of course the Dynamite takes that challenge to a whole new level with its wave cabin shape. By using a CNC woodcutting machine on glued MDF boards, the exterior waves are created. Thru computer modeling the exact bracing for strength and sonic wave elimination are put in place. In order to meet the $2,999/pair price the CNC work is done outside North America. Everything else in the assembly process takes place in Ontario, Canada.

Read the full review here.

Coincident is excited to announce that 8 years after its introduction, the Pure Reference Extremes are undergoing an update of significant proportions. The improvements include the following:

  1. All drivers and crossovers will be internally wired with our state of the art Statement cabling;
  2. The tweeter and midrange drivers will be improved to the latest versions of the Accuton ceramic units;
  3. The crossovers will be updated and improved with superior components with some parameters being slightly adjusted.

The sonic results include: greater sense of transparency and immediacy, more extension and air in the upper frequencies, more harmonic completeness in the mids, greater revelation of low level detail and ambient information, and enhancement of visceral punch and impact in the mid bass and bass and seamless coherency from top to bottom.

Although considered by many as the finest speaker available at any price and without question at its selling price, the latest version of the Pure Reference Extreme now advances to a new level of performance.

While the cost of the mods are substantial, the price increase will be offered on an introductory basis at only $1000 more per pair - $29, 499 US /pr.


The Coincident Dynamo SE 34Mk. II

The Most Fun 8 Watts Per Channel You'll Ever Hear!

Review By Jeff Dorgay


Coincident Speaker Statement Dynamo 34SE MK II review by TONEAudio MAGAZINE

There is a coherence to the single ended triode design that is tough to ignore. Passing the signal through a single triode in the output stage has a grain free purity that will have you converted in no time at all.

Critics around the world raved about the original version of this amplifier (Priced at $1,295) and though I haven't had any personal time with the original, every other Coincident product I've auditioned or owned has been a top of class product. The current Mk. II version is now $1,495, and has had nearly every component beefed up. Bigger transformers, bigger capacitors, more power supply capacity, etc., etc.

And the chassis is beautiful. As Coincident's owner Israel Blume comments, "While far more costly than chromed steel, stainless steel is non-magnetic, eliminating hysteresis distortion and the mirror finish is permanent = unlike chrome, which is prone to pitting and eventual peeling." This is not only a component you want to put front and center ? proudly, it?s a component you will probably hand down to a family member.

Heading straight for the female vocal tracks, Anja Garbarek's Smiling and Waving proves a revelation, with Ms. Garbarek's voice materializing between the two Coincident Dynamite speakers that have been sent along to review. My other favorites, Ella Fitzgerald, Shelby Lynne and Anne Bisson all seem to just walk out from inside the speakers in such an effortless, grain free, natural way. Even though they have a sensitivity rating of 90db/1-watt, the Mk. II drives them with authority.

It feels more like a 20 or 30 wpc amplifier, and my old Dynaco Stereo 70 (30wpc on a good day) runs out of steam quicker than this 8-watt per channel wonder. It?s amazing what solid vacuum designs coupled with modern manufacturing can produce.

Read the full review here.


Coincident Speaker Technology

Statement Cables

Statement Cables review:

Coincident Speaker Technology est reconnu pour son rapport qualité prix assez inhabituel. Certes, la vente en direct explique sans doute une partie de la compétitivité de la production de Monsieur Israel Blume, mais les produits Coïncident Speaker Technology (CST) sont loin d'être fabriqués au rabais ou à l'économie, et sont, au contraire, conçus en utilisant des composants de qualités, dans un souci premier d'offrir le maximum de transparence et de naturel possible. Vous conviendrez que c'est plutôt un bon point de départ lorsqu'on vise la très haute fidélité...

L'entreprise canadienne a également le mérite d'avoir une production assez diversifiée entre enceintes et électroniques à tubes. Israel Blume propose ainsi un catalogue de produits qui s'étoffe petit à petit, avec des références qui s'inscrivent par ailleurs dans la durée.

C'est le cas de mon préamplificateur personnel (Coincident Statement Line Stage) qui reste chez moi un maillon central depuis de nombreuses années, sans que bon nombre de préamplificateurs passés entre mes mains aient réussi à le remettre en cause, et ce en dépit d'un prix relativement modeste dans le segment du high-end.

Israel Blume étant un constructeur très polyvalent, à l'instar d'un Touraj Moghaddam (CEO de Vertere et ex patron de Roksan), il restait à tester ses câbles, et pour éviter de tergiverser ou de supputer sur le potentiel de sa production, je me suis directement concentré sur sa nouvelle référence très haut de gamme : la série Statement !

Read the full review here.

2017 TAS Editors' Choice Awards

Dynamo MK II
Editors Choice
The Absolute Sound
2017 TAS Editors' Choice Awards
M300B Frankenstein MK II
Editors Choice
The Absolute Sound
2017 TAS Editors' Choice Awards

World Premiere Review!

Classy styling and sophisticated sound for passionate music lovers.
Review By Rick Becker

Coincident Speaker Technology

Dynamite Floorstanding Speaker

Coincident Speaker Technology Dynamite Floorstanding Speaker review by

It's no secret that interior design has been trending modern for quite some time now. The trend was originally labeled "transitional", a blend between contemporary and traditional that remains popular with Boomers and Gen X. But "modern", in the flashback of "Mid-Century Modern" has caught the fancy of anyone younger than that. In furniture, there is a strong minimalist theme to Mid-Century Modern, but in a lot of other categories (think: cars and cutting edge hair styles) there is a lot of swoopiness happening, and in clothing and personal accessories (think: watches and jewelry) there is a lot of bling being bought. I suspect a lot of this is due to the homogenization of global cultures brought on by the smart phone with its built-in camera and internet access. Almost everything can be seen by almost everybody. And a lot of those "everybodies" aspire to what the wealthy have, as unbridled capitalism threatens to enslave even the most powerful of national governments.

Read the full review here.

World Premiere!

A gateway product to high-end tube gear.
Review By Rick Becker

Coincident Speaker Technology

Dynamo 34SE MK II

Coincident Speaker Statement Dynamo 34SE MK II review by

Oh geez, not another Coincident review by Rick Becker? Well, yes, and for good reason in this instance. The original Dynamo 34SE was my go-to amp for the $5000 Entry Level Project back in August of 2014 and I eagerly snapped up the review sample for my personal low power reference and headphone amplifier. My review today of the Coincident Speaker Technology Dynamo 34SE MK II is to find out what improvements have been made. Getting back to the original, it was an outstanding performer with efficient speakers and a very high value at $1299. Here was an opportunity for a direct comparison review between that amp and the new Coincident Speaker Technology Dynamo 34SE MK II.

Read the full review here.

Coincident Speaker Statement Linestage Review by Tone Audio

Coincident Speaker Statement Linestage Review by Tone Audio

The Coincident Statement linestage delivers performance so far beyond what you'd ever expect from a $5,495 box, all audiophile clichés are rendered irrelevant. Tightly focused in nature, the Statement delivers high performance and is beautifully packaged in polished stainless steel.

With two inputs and two outputs each (switchable between RCA and XLR), control flexibility is limited. But seriously, how many of you have more than a DAC/ streamer and a phonostage anyway? If you can get by with this and forgo the flexibility of a remote control, the Statement delivers sheer performance that a lot of $20,000 preamplifiers don't.

This two-tube marvel, with a massive 42 pound external power supply, renders a musical picture that is dynamic, tonally gorgeous and quiet. With replacement 101- D tubes only costing $200/pair (a pair of premium, matched 101-Ds more, at $700/pair) and a claimed life of 5,000 - 10,000 hours, this one won't break you when it's time to retube.

The Statement is as good as it gets and after 12 years of reviews, we'd put it right at the top of what is possible in preamplifiers at any price. That you can get one straight from Coincident for $5,495 is the high end audio bargain of a lifetime.

Coincident Speaker Statement Linestage Review by Tone Audio

The Coincident Statement Linestage

Nothing but Performance

By Jeff Dorgay

TONEAudio Magazine - Awards Issue. No.80 2016 Coincident Speaker Statement Linestage Review by Tone Audio

As the grungy lead guitar riff of the Drive-By Truckers' latest album American Band fills the room, it's clear that the Coincident Statement Linestage is a cut above. Way above what you'd expect from a $5,499 line stage. In some circles, you can't even buy a power cord for five grand, let alone a line stage that holds its own with some of the world's finest by the known brands. Gorgeously shiny, this two chassis masterpiece from Canada is just as stunning as the Statement Phonostage we reviewed a few years ago. Coincident's founder, Israel Blume, makes it a point to tell me that the chassis is not chrome plated, but high grade stainless steel, highly polished, which has multiple benefits. "The polished stainless is much more labor intensive, and unlike chrome plating, will never pit or peel. And, the non-magnetic nature of stainless steel provides a significant sonic benefit by eliminating any electromagnetic interaction with the transformers and audio circuitry." After many hours of listening, it only gets better.

Read the full review here.

Coincident Speaker Technology

Dynamo 34SE

The Absolute Sound - Buyers Guide 2017 - Issue 267


The swanky Dynamo isn't your typical 8Wpc single-ended triode (SET) design. There is no 300B triode in sight. A 6SL7 dual-triode drives a triode-connected EL34 output stage. There is no global feedback and the power supply is tube-rectified. The 5U4G rectifier arc'd briefly on DO's sample when the amplifier was powered up. Coincident considers this to be a normal event, but any arc'ing is cause for concern when it comes to the rectifier's lifetime. The input signal is routed through a 100k-ohm pot allowing a direct connection to an external line-level-source. Expect a sweet midrange, an exceptionally dimensional soundstage, and a dynamic presentation belying the amp's miniscule power rating-at least when driving a high-sensitivity loudspeaker. Harmony textures aren't overly liquid, implying decent-bandwidth output transformers. Treble textures can be improved via judicious tube rolling. Here is an amp that shouldn't be defined on the basis of it's cost. It captures much of the magic of SETs at an entry-level price point. Because of its high source impedance the Dynamo may not always yield the most accurate tonal balance, but the crux of the matter is foot-tapping musical bliss. (250)

Préamplis à tubes haut de gamme





C'est un premier face à face inédit entre un représentant de l'industrie électronique de précision Suisse et un autre de la grande tradition nord-américaine des préamplis à tubes.

Ces deux-là sont des propositions assez uniques dans leur genre, avec d'une part un nouveau Nagra tentant d'imposer un schéma sans fioritures avec des liaisons courtes et directes, et d'autre part un préampli canadien mettant en œuvre des triodes à chauffage directe vintage sur des liaisons encore plus courtes et minimalistes. C'est presque un test match sur la transparence, qualité essentielle pour un préamplificateur de haute volée. Et ce qui est sûr, c'est que nous avons affaire là à deux appareils de très haut niveau.

Le but de cette confrontation n'est pas forcément de désigner un vainqueur parmi ces deux appareils d'exception mais de présenter des caractéristiques qui pourront, en fonction des besoins et du système de chacun, faire pencher la balance d'un côté ou de l'autre...

Read the full review here.

Coincident Speaker

Coincident Speaker


Coincident is very excited to announce the introduction of the Dynamite loudspeaker. This represents the initial foray for Coincident into the realm of floor standing, full range, high end speakers at a decidedly mid fi price. In keeping with the philosophy that began with the release of the Dynamo 34SE amplifier, the Dynamite loudspeaker offers build quality, design, aesthetics and performance that was previously not possible at this price point. The combination of the Dynamite and the Dynamo yields high end sound at an unbelievably affordable price.

The Dynamite is capable of reproducing all types of music, in a manner that will satisfy the demands of the most seasoned listener. Its compact footprint makes it an ideal speaker for those with limited space and yet it is fully adept at filling a spacious listening environment. Due to its high sensitivity and wide power handling capabilities, amplifier choice is a personal one. Single ended triode tube amps fully realize their inherent sonic advantage mated to the Dynamite and those with a preference for higher power tube or solid state amps will be equally enamoured by the results.

The same design approach and philosophy of enclosure materials, crossovers and driver choice apply to the Dynamite as it does to the vastly more expensive Coincident models. The breakthrough price to performance ratio has become possible due to high volume and efficient production, off shore cabinet construction, direct to consumer pricing and the lowest mark up structure in high end audio.

Read More

2016 TAS Editors' Choice Awards

Dynamo 34SE
Editors Choice
The Absolute Sound
2016 TAS Editors' Choice Awards

The Dynamo offers an alternative to the traditional 300B-based single-ended-triode amplifier, using, as it does, a triod-connected EL34 pentode.Driving a high-sensitivity, high-impedance loudspeaker (96dB/8-ohm minimum), it is capable of an explosive first watt. Superlative soundstage transparency combined with 3-D image outlines produce a strong sensation of being there.

M300B Frankenstein MK II
Editors Choice
The Absolute Sound
2016 TAS Editors' Choice Awards

One of the best-sounding 300B SET apms DO has auditioned, Israel Blume's Frankenstein IIs deliver on the promise of SETs: a midrange to die for, wonderful tonal color saturation, and spectacular imaging. In short, a sensational first watt! Its combination of affordability and performance makes for a screaming buy reccomendation with the right speakers.

Dynamo 34SE MK II Amplifier

After the overwhelming success of the Coincident Dynamo 34SE amplifier ( Editor’s Choice TAS, Blue Note Award by ) we are excited to announce the Dynamo SE 34 MK II. The MK II contains a whole host of significant upgrades that not only enhance performance but dramatically improves reliability, virtually eliminates noise, hum and susceptibility to AC line variation and fluctuation. The end result is taking the already breakthrough performance and build quality of the finest value amplifier in existence and elevating it to a new level of excellence in every parameter. The improvements include the following:

1. Power Supply - The power transformer has been enlarged by 50%. Much improved insulation and winding techniques result in noiseless operation, and a 40% reduction in generated heat levels.
Filtering and energy storage has been increased by a whopping 70%. The sonic improvement is substantial- deeper, more impactful lower frequencies, wider dynamics and the ability to drive a much wider range of speakers without strain. Distortion levels at high SPLs and low frequencies has been reduced by 35%. Furthermore, the large power supply has now been isolated from the sensitive input circuitry resulting in the elimination of electromagnetic interference.

2. Chassis - Not only is the chassis 20% larger in order to accommodate the huge new power transformer, it has been stiffened and braced to reduce unwanted resonances. Sonically this translates to greater purity and transparency. The Dynamo has gone from weighing 22 lbs to 30 lbs.

3. Capacitors- Every single capacitor has been doubled in voltage capacity which provides bullet proof reliability and eliminates potential problems in areas afflicted with high AC line voltage that is prone to surging and/ or fluctuation.

4. Tube Rectifier - The previously used instant on 5U4GB rectifier tube has been replaced with the soft start 5AR4. This provides a safeguard against excessive inrush current upon turn on.

The overall improvement wrought by the MK. II is highly significant. From virtually eliminating noise so that the Dynamo can successfully be used with ultra high sensitivity speakers and increasing its power capabilities so that it can mate with a wider range of lower sensitivity speakers to unshakeable reliability in any environment to stunning performance enhancements that include deeper, punchier bass, greater transparency and purity overall, more expansive soundstage and greater extension and air in the treble all combine to create an amplifier that while is hard to surpass at $5000, is unmatched at its value laden price of only $1499 US. While the original Dynamo 34SE at $1299 US was considered the finest value in all of high end audio, all the huge and costly improvements incorporated in the MK. II with only a $200 increase in price, make the MK. II even more of an audiophile bargain.
 Audio Reviews

Reviewer: Tim Smith
Financial interests: click here
Source (digital): 2 TB iMac 27” quad-core with 16GB RAM, AIFF, iTunes, streamed to Apple Airport Express; Musical Paradise D-1; MHDT Labs Paradisea+; Maverick Audio Tube Magic D1; Marantz SA-8003 and SA-15S2 Limited Edition SACD players; Marantz CD5003 and 5004 as transport; Resonessence Labs Herus
Source (analog): Pro-Ject RPM 10.1 with Dynavector 10x5
Phono preamplifier: Graham Slee Era Gold Mk V
Preamplifier: Audio Research LS17
Amplifiers: FirstWatt F5; Line Magnetic 518IA; Wyred4Sound SX-1000 monos; Musical Paradise MP 301MkII and mk3 Deluxe; Coincident Dynamo SE; Bottlehead Crack DIY amplifier, Musical Paradise MP-303
Loudspeakers: Harbeth Compact 7-ES3; Tekton Design M-Lore; Magnepan 1.7; Mordaunt Short Carnival 2; DIY with Fostex FE 103; Pioneer SP-BS41-LR
Headphones: Beyerdynamic DT 770 (32 Ohm) and DT 880 (600 Ohm); HiFiMan HE-400 with Audio Sensibility Impact SE 7N OCC cables
Cables: Audio Sensibility Impact SE; DH-Labs Q-10; Connex/DH Labs BL-Ag; Kimber Kable 4TC, PBJ; Paul Speltz Anti-Cables; Canare; Cardas; QED; Connex/DH Labs power cords; Shunyata Research Venom HC
Power conditioning: Shunyata Research Venom PS8 with Venom Defender; Emotiva CMX-2
Equipment rack: Apollo, Target, Tableau
Isolation devices: Cardas blocks; Teo Audio-supplied 'earthquake foam'
Speaker stands: Skylan
Room size: 8.5 meters long with nook at each end; 3.3 meters wide; 2.1 meters high
Review component retail in USA: $1'499

'Anything you can do I can do better; I can do anything better than you' wrote Irving Berlin for the 1946 Broadway show Annie Get Your Gun. This is the implicit message of audio designers who launch a 'mark 2' version less than two years after the initial offering, sometimes to the chagrin of the purchasers of the original. When Israel Blume emailed 6moons to ask if I would be interested to follow up my September 2014 review of his $1'299 Coincident Dynamo 34SE with a comparison to the new $1499 Dynamo MkII, I was surprised. I'd thought the original was a fabulous amplifier punching well above its weight in just about every category. If it ain't broke, don't fix it. Having engaged in an obsessive buying binge of ChiFi push-pull and SEP amps from 2010-2014, I thought that the Dynamo was possibly without peer at its price. Accordingly, I'd bought the amp which since 2014 has acted as the solid anchor of my second system adding weight, warmth and drive to every small bookshelf speaker I paired it with. If the Dynamo had more than one input and remote control, I'd be tempted to sell more expensive gear and use it as my main amplifier with high-efficiency speakers. What could the MkII offer which the original amplifier had not?

As it turns out, a great deal. Your additional $200 buy an extra 4.5 kilos or 10 pounds of transformer iron, bigger and better capacitors, a shorter signal path, better grounding and several other upgrades. This 15kg amp is to the single-ended pentode EL34 amp family what the 45kg Mastersound amps are to the single-ended triode 845 genre. With their over-spec'd transformers bulging from their cases, these products surprise with their ability to manhandle complex music.

With substantially larger irons, the Dynamo MkII is not simply more of the same. It's like going from the Prologue to the Dialogue series in the Primaluna product range. They are worlds apart. Capacitance goes up 50% for more headroom and deeper bass - not just drier and deeper bass but noticeably more dimensional and on certain recordings, it must be said, a touch of bloat. Sonically this is the only weakness but entirely expected of a SEP amp. Ten extra pounds of iron won't overcome the typology's limitations. But with each passing year it seems that the gap between tube and transistor amps narrows and the MkII is clear proof. With voltage capacity increased by 40% and a shorter signal path, there should be more incisiveness and certainly is. Guitars pierce the air just a little bit more. The MkII seems a bit faster, better able to keep up with techno beats, better able to track dynamic swings with orchestral music and heavily produced rock. I was thoroughly satisfied with the way the Dynamo MkII handled "Dark Side of the Moon". it was noticeably more propulsive than the MkI and rendered the clock bells on "Time" with a touch more depth and body. Micro detail emerged from a quieter background. This amp strove for a different sonic signature.


Read the full review here.

Enjoy the's Special 20/20 Award
High-End Audio Loudspeakers

Steven R. Rochlin chooses the most notable products during the past 20 years.
As Chosen By Editor & Creative Director Steven R. Rochlin

Coincident Speaker

Technology Total Victory IV

Longstanding Canadian manufacturer Coincident Speaker Technology produces critically-acclaimed amplifiers and loudspeakers. Rick Becker reviewed their Super Victory loudspeaker and felt that following up with their upper line Total Victory IV ($14,999 per pair) would be a simple task. What he was not prepared for was... "The step from the Super Victory to the Total Victory will be necessary if your room is about 6000 cubic feet or larger" says Rick. "I expect when putting a TV IV in a smaller room the extra $5500 will buy you mostly the qualitative improvements (versus the smaller model)... It is not that the three models sound dramatically different from one another in tonal balance. But as you move up the line the audible quality improves and they can play in larger rooms. The common denominators: slightly warm, non-fatiguing, very revealing, transparent, dynamic, totally enjoyable." You can read Rick Becker's review of the Coincident Speaker Technology Total Victory IV speaker here.


Enjoy the's Special 20/20 Award
High-End Audio Preamplification

Steven R. Rochlin chooses the most notable products during the past 20 years.
As Chosen By Editor & Creative Director Steven R. Rochlin

Coincident Statement Line Stage

While any award list has the obvious components you've read about time and again, yet what about those secret sleepers? Lovers of vacuum tubes might not have used the truly beautiful 101D. Not sure why as it proves its merits within the Coincident Statement Line Stage ($5000). The two large 101D tubes are about the size and shape of a standard incandescent light bulb and give off a gentle glow. This two-chassis design includes a 40 pound separate power supply to mate with the 30 pound linestage. There are two unbalanced RCA inputs and balanced XLR, with outputs being both RCA and XLR. We're not quite sure how Coincident gives you so much for $500, yet we're surely not complaining either. "When I first heard the Statement Line Stage I knew it was a very special piece," says reviewer Rick Becker, "But it took some playing and tweaking to learn how good it really is. You can't build a world class system with a plug 'n' play mentality. As a replacement for a full function preamp it will force you to re-think your front end, yet it also offers flexibility for bi-amplifying as well as a balanced source and balanced amplifier. The seldom seen (but not outrageously priced) 101D tube is the crown jewel of this design and it will give you a high degree of exclusivity in audiophile circles. Sonically, the Statement is a thoroughbred with Triple Crown potential, a serious assault on the State of the Art at a price that should recalibrate "value" in the high-end. It may very well be the finest piece ever to have come from the mind of Israel Blume. I expect it will remain my reference for many years to come." Read Rick Becker's review of the Coincident Statement Line Stage here.


2015 TAS Editors' Choice Awards

Dynamo 34SE
Editors Choice
The Absolute Sound

Dynamo 34 SE -The Dynamo offers an alternative to the traditional 300B based single - ended - triode amplifier, using , as it does, a triode - connected EL 34 pentode. Driving a high - sensitivity , high impedance loudspeaker, it is capable of an explosive first watt. Superlative soundstage transparency combined with 3-D image outlines produce a strong sensation of being there. DO, 250.

M300B Frankenstein MK II
Editors Choice
The Absolute Sound

Frankenstein M300B MK. II - One of the best - sounding 300B SET amps, DO has auditioned. Israel Blume's Frankenstein IIs deliver on the promise of SETs: a midrange to die for, wonderful tonal color saturation, and spectacular imaging. In short, a sensational first watt! Its combination of affordability and performance makes for a screaming buy recommendation with the right speakers. DO, 228.

2014 TAS Editors' Choice Awards

Partial Eclipse II
Editors Choice
The Absolute Sound

Pure Reference
Editors Choice
The Absolute Sound


Frankenstein II
Editors Choice
The Absolute Sound


Super Victory
Editors Choice
The Absolute Sound

The Absolute Sound - Issue 256


Back Page

Israel Blume, President,

Coincident Speaker Technology

Neil Gader


What ignited your passion for the high end? Did it come from the music side or the electronics side?

My passion was ignited when, during my first year at university in 1972, I started working at an audio store. I came across an amp and a preamp and had no clue why two components were necessary when a receiver performed the same task. I listened to the separates playing Bad Company, an LP I had heard numerous times. But never like this. That was it. My passion for audio was transformed to a virtual obsession. That experience changed my life forever. It has always been about the music. The hardware became its harbinger to deliver the musical message more convincingly and at a much higher level. I quickly became fascinated by the components and knew my future would be inextricably interconnected to the creation of components that would be responsible for enhancing the musical experience

What was your first high-end system? What year was this?

1973. Luxman M75 power amp, Luxman CL 35 preamp, Acoustique 3A Master Control speakers, Micro Seiki turntable.

When did audio develop from a hobby to a career?

From 1972–76, I continued to work part-time and summers at that audio store, gradually being responsible for transforming it from a purveyor of mid-fi gear to high end. We started selling Acoustat X speakers, Luxman separates, etc. Afterwards I began importing high-end gear into Canada and began to build and modify components on a special order basis. I started Coincident Speaker Technology in 1993 for the sole purpose of creating the finest loudspeakers in the world, which eventually blossomed into the creation of the entire audio chain except for a source component.

What education did you receive?

Undergraduate and Master’s degrees in science and a Doctor of Laws degree. How do you find the time to design electronics, loudspeakers, and cables? Music and the creation of audio components are my obsession. It literally is a sevendays- per-week preoccupation fueled by the insatiable desire to create the most musically satisfying audio system possible. Being meticulously organized and efficient has proved to be invaluable.

How do you define the difference between hi-fi and high-end audio?

My definition of a high-end audio system is one that has the capability of making the listener forget the hardware and become totally and completely immersed in the musical experience. Hi-fi involves those who use music to listen to and evaluate their systems. The music must always be the end, not the means to the end.

Analog or digital—what is your preference and why? Do you still enjoy LPs?

No doubt, it is analog. Digital has come a long way and has reached the point where the enjoyment of music is achievable. I listen to the best digital and my reaction is positive until I put a great LP on my reference turntable. Digital as well as solid-state electronics share the same deficiency when it comes to replicating the live musical event in a home. Namely, the inability to render harmonics accurately and to capture low-level detail. Both media do very well in transmitting musical fundamentals but when the proportion of fundamentals to harmonics is skewed, the end result is music reproduction that never sounds real. The finest analog and tube technologies both possess this quality. Even non-audiophiles can clearly hear the greater sense of realism presented by the LP.

Are you surprised at the resiliency of high-end two-channel?

It does not surprise me, since for those who love music, a two-channel audio system will simply pull one into the magic that is music.

How will high-end systems change in the next ten years or so?

Analog and high-performance two-channel music systems will continue to exist albeit in declining numbers. The future will see the overwhelming majority either not have any form of audio system at all or gravitate to more convenient, very simple forms of audio reproduction.

What are the greatest challenges confronting the high end?

The new generations are weaned on multitasking and sensory overload. High-end audio depends on those who derive tremendous satisfaction and joy through focusing on listening to music devoid of distraction. The new generation does not appear to embrace this most rewarding of human experiences.

Outside of audio, what do you do for fun?

I am a car nut and love driving high-performance sport cars and caring for them. Working out every day is also a life’s mission from which I do not deviate.

What still inspires you about your work?

The love of music and creating components that enhance the musical experience not only for me but also for all other music lovers. Nothing gratifies me more than a Coincident buyer who tells me that my gear has enhanced his life.



Click on the image to view print version.











Coincident Speaker Technology
Statement Series Cable
White Paper

CST Advanced Technology- The Latest Breakthrough

To celebrate Coincident Speaker Technology 20th Anniversary, we are thrilled to announce the Statement Series  – A breakthrough in cable technology and performance. The Statement Series' superiority is not predicated on a single novel technique or approach but rather that the design for the Statement Series (and the CST Extreme) is based upon genuinely advanced technology, applied in a "total system" approach, to each specific cable application, always in accordance with CST's basic controlling philosophy that the cable should pass the signal exactly as it receives it, with no addition, subtraction, or perversion. 

One example of CST's advanced technology is found in its proprietary "WaveLink" winding geometry. Although many other cable manufacturers recognize the effects of ambient electromagnetic fields, and some (but many do not) are cognizant of electromagnetic fields self-generated by internal current flow, Coincident is still one of the few cable manufacturers in the world to recognize and design for the fact that all cables in operation generate both electromagnetic and electrostatic fields within and surrounding them.

These internally generated fields (the intensity of the electromagnetic field controlled by current flow, and that of the electrostatic field controlled by voltage) both – individually and by their interaction – affect the signal passing through the cable, and therefore profoundly impact the sound of the entire system. 

Signals passed in each cable application all have different relative amounts of current flow (amperage) and voltage1, but there is only one optimum relationship for the two fields that result from them. Therefore, every CST cable, in every series from Extreme all the way up to the STATEMENT Series, is specifically designed to produce that one optimum relationship in its own application.  CST cables are wound uniquely and look different from each so that all will have the same optimum field relationship, whatever their application.  This is CST's exclusive "WaveLink" technology, and it's one of many of the reasons CST cables sound closer to the original signal than its competitors.

The STATEMENT Series' incredible detail, focus and ambience retrieval lies in another example of CST's advanced technology: Functionally, cables (of any brand, even CST) have many of the characteristics of capacitors:  They store energy in their dielectric (on a cable, that means the insulation) and they release it out of phase, directly into the signal path every time the carried signal changes polarity.  This out-of-phase energy results in cancellation of the signal information at very low levels (like the fifth bounce of the music off the walls of the concert hall), and works to reduce detail, blur imaging, and even result in "phantom" signal artifacts ("noise" signals that aren't a part of the recording being played) to further compromise  listening enjoyment.  Coincident is one the few cable manufacturers to recognize and successfully address this important issue.

Cable Design and Construction – What is Important? – Everything !

Coincident's "total system" approach to cable design is exactly what the term implies: Every aspect of every parameter of each CST design is taken into consideration and optimized, before the design is finalized and put into production. This painstaking process takes years and literally thousands of hours of R & D and aural evaluation.

Many cable manufacturers believe that there can be one "magic" solution that will always result in "perfect" cables. This simplistic approach will yield a highly compromised product.  While many view cables as bits of wire and plastic, cables are extremely complex in their operation, and each of its component parts greatly affects their performance:  The geometry and material used for the conductors (usually either copper or silver in most audio cables) has a clear and obvious effect on the sound of your system.  Equally relevant is the thickness (the AWG gauge) of the conductors, their purity, how they were made, and whether they are solid-core or stranded.  Dielectric and capacitive discharge effects mean that the choice of insulating material for the primary wires, it's dielectric constant, its "dielectric absorption" or "dissipation factor", its "dump rate", and how thickly it's applied and its air to solid ratio are all crucial in accurately passing the signal the cable is fed. Furthermore, the type and thickness of each of the overall conductor jackets, the filler materials, if any, and the final overjacket on the finished cable all combine to greatly impact on the veracity of the resultant signal. Whether or not the cable is shielded is highly significant as well, because shielding – even shielding done the way CST does it – can affect sound quality and overall system performance.  And so can the spacing of the shield, if any, over the cable and the spacing of the conductors within it: The distance between them determines the capacitance and inductance of any pair of conductors, and those factors, plus the resistance of the conductors themselves, are the sole determinants of the cable's characteristic impedance.  The ultimate importance of absolutely everything in cable design is perhaps best illustrated by the circularity of its center core. If it is not perfectly round it will significantly affect how closely a coaxial cable will conform to its designed impedance specifications.

In designing its cables, Coincident takes every factor into consideration. Falter or neglect any design or construction parameter and the cable will be severely degraded. It is for these reasons that the STATEMENT Series is uniquely superior to virtually all other cables at any price, let alone at its unheard of selling price. Unlike other products that involve compromises that must be made to comply with budgetary considerations, the vagaries of the market, or the realities of manufacturing, the STATEMENT SERIES is designed and manufactured with none of the aforementioned restraints.

The STATEMENT Series is different. Absolutely uncompromised in any way, and representing the fullest development of the thoughts and skills of designer Israel Blume, the STATEMENT is, even as compared to CST's justly popular Extreme, a huge step forward. The goal of the STATEMENT SERIES is to produce a line of cables that pass the musical signal with as little coloration as possible and to replicate the accuracy of a direct bypass- in other words, to sound like no cable at all.

The STATEMENT Series Product Line

The STATEMENT Series consists of only six products:ST-1, The Single-Ended Interconnect, ST-2, The Balanced Interconnect, ST-4, The Digital Interconnect, (available either balanced or single-ended), ST-5, The Speaker Cable, (along with its companion product the ST-5/JS Jumper Set) andST-10, The Power Cable.

Materials and Construction

STATEMENT Series Interconnects

All CST STATEMENT Series interconnects and digital cables are made from custom-drawn and specially treated PC-OCC (Pure Copper, Ohno Continuous Cast copper, which is so pure that it actually exceeds the test capabilities of any commercial laboratory.  The conductors of this extremely expensive material are individually insulated with thin films of a special PTFE-related fluoropolymer material and then arrayed in CST's own proprietary "WaveLink" geometry between an air- and nitrogen-bearing concentric two element fluoropolymer central core and a single element air-bearing fluoropolymer outer core. The insulation and core structure thus formed has a lower effective dielectric constant than any other kind or combination of commercially available materials. Where necessary for balanced or AES/EBU operation, a special grounding network is incorporated within the central core.

All connectors used on STATEMENT Series interconnects and digital cables are made to CST's own high standards.  Every connector is non-magnetic, to avoid hysteresis effects, and each is designed for minimum self-inductance.  Every part in the signal path of every STATEMENT Series connector is precision manufactured from either ultra-pure copper or from an ASTM-designated copper alloy selected to be best for its particular application. Where gold plating is used, it is applied directly, with no nickel substrate, just thickly enough to prevent connector tarnishing, without affecting sound quality. To ensure minimum self-inductance, steps are taken on every STATEMENT Series connector to remove all conductive materials not absolutely necessary to signal transmission from the signal path.

Speaker Cables

CST STATEMENT Series speaker cables are made from the same specially treated ultra-pure (exceeding U.S. commercial lab test capabilities) "PC-OCC" copper as is used for STATEMENT Series interconnects and digital cables.  Multiple small-diameter conductors (23 AWG) of this material are individually insulated with thin films (0.076 mm or less) of a special PTFE-variant fluoropolymer material and implemented in accordance with Coincident"s special "WaveLink" geometry, over air-bearing composite multi-element concentric PTFE-variant core structures to make the cable's four individual conductor "legs".  Each of these four legs is then wrapped and extruded with a twin-element PTFE-variant fluoropolymer jacket and the four legs are cabled,  either around an air-bearing central core member or a special into a minimum-inductance "quad", and finally given a braided protective mesh outer jacket.

STATEMENT Series speaker cables are eight conductors of 16 gauge (AWG) in their normal "shotgun" configuration (2 legs per conductor) or four conductors of 12 AWG when terminated in the optional "bi-wire" mode. Protruding through these caps at either end are the actual hook-up ends of the cable.  These are sheathed in multi-element air-dielectric tubes. The actual termination is, in every case, an individually billet-machined cryogenically-treated 24K direct gold-plated copper spade lug (of either 6.0 or 8.5 mm terminal size). Premium Deltron™ brand bananas are also available.

Specific Product Descriptions

ST-1 Single-Ended Interconnect - Much larger in diameter than would normally be expected from Coincident, this STATEMENT Series cable features unique jacketing braided from dense wear-resistant polyester. This results in truly remarkable dielectric characteristics and an understated, elegant "stealth-like" appearance and texture reminiscent of carbon fiber. Fully symmetrical windings and special geometry make this shielded single-ended cable unusually resistant to EMI and RFI.

Price:  $595 US/ 1M pr.
$175 US each additional .5 meter pr.

ST-2 Balanced Interconnect - Similar in construction and jacketing to the Single-Ended Interconnect, this 3-conductor, "true balanced" shielded cable relies upon the Common Mode Rejection inherent to balanced ("differential mode") operation to provide outstanding sonics. Special STATEMENT Series XLR connectors are custom machined and precision die-cast, with pins (male) and pin receptacles (female) of billet-cut Tellurium copper or patented Brush-Wellman Alloy 174 beryllium copper as standard.

Price: $695 US/ 1M pr.
$195 US each additional .5 meter pr.   

ST-4 Digital Interconnect - Designed for instantaneous rise-time, broad bandwidth, and the lowest available cable-induced jitter of any product currently available, this STATEMENT Series cable has been adopted as an absolute reference standard by manufacturers of some of the most technically advanced digital equipment in the world and is the cable of choice for many of the world's most critical and demanding audio reviewers. ST-4 cables are available either unbalanced, with RCA or BNC connectors, or in balanced configuration with XLR connectors, for AES/EBU applications.

Price: $495 US/ 1M

ST-5 Speaker Cable -  Six AWG multi-core construction ready for either "shotgun" or "internal bi-wire" application; billet-cut direct gold-plated cryogenically-treated copper fittings, make this the speaker cable of choice for systems that really do strive to duplicate the reality of the musical experience.   

Price: $1995 US/ 6 ft pr.
$ 295 US each additional ft pr.

ST-5/JS- (Jumpers) – Are an alternative to using biwire speaker cable. The jumpers are made from the same conductors and dielectric materials as the ST-5 speaker cables and exactly replicate their performance.

Price: $795 US/ 8" set of 4.

ST-10 AC Power Cable (Previously Called the Extreme II) - This is the ultimate premium version of the spectacular new power cord that's getting rave reviews from audiophiles and reviewers everywhere.  Sharing an entirely new approach to power transmission technology with CST's  Extreme AC cable, it's an 10+ equivalent gauge (AWG), multi-conductor, PEX dielectric masterpiece that will clearly and obviously outperform almost any other AC power cable several times its price.  Amazing high frequency detail, sweetness and extension, coupled with greater image width, depth and focus, plus utterly astounding bass "weight", power and "slam" make this new power cable a required addition to any High-End system seriously intended to challenge the state of the art. Due to unique geometry and special double shielding, AC noise levels and RFI are dramatically reduced. Furthermore, the absence of any current limiting makes this cable especially excellent mated to high power amplifiers. ST-10 AC power cables are jacketed in special densely - woven braid.  Each power cable is fitted with premium Hospital-Grade U.S.-style NEMA 3-prong plugs and 15A IEC connectors.  European-style Schuko or 20 Amp connectors are also available at nominal additional cost.

Price: $595 US/ 6 ft.
$695 US/ 6 ft  ( Schuko )     
$  70 US each additional ft.


1 The signal passed by phono cables is tiny fractions (thousandths or fractional thousandths) of an Ampere of current at equally tiny fractions of a Volt.  The signal carried by an unbalanced interconnect in a high impedance circuit is just millionths of an Amp at as much as 10 Volts; that of a balanced interconnect or digital cable in a matched-impedance circuit is milliamps (thousandths of an Amp) at, again, as much as 10 Volts; and that of a speaker cable may be as much as 50 or 60 Amps of current at as little (typically) as just a few thousandths of a Volt.


Coincident Speaker Technology
A very special Canadian high-end audio company!


February 2013 

For many years Enjoy the has been reviewing gear The Coincident Speaker Technology Total Victory IV | Frankenstein MkIIfrom Coincident Speaker Technology. The company was founded and is operated by Israel Blume in 1993 for the sole purpose of creating a superior loudspeaker. Being dissatisfied with every loudspeaker he had ever owned or listened to, Israel Blume decided to manufacturer speakers for those seeking high-end performance. Blume put his over twenty five years of audio and music experience to work to conceptualize a loudspeaker that would reproduce music with no obvious or distracting perversions. He understood quite well the inherent limitations of various designs and thus began designing a new loudspeaker combining the best sonic attributes of cones and electrostatics. A daunting task to say the least! The first loudspeaker designed by Blume was the Concentric Monitor and its companion subwoofer, the Super Bass Monitor.

What made this speaker unique was its cylindrical enclosure. Unlike conventional cabinets, the Monitor was constructed out of computer cut MDF concentric rings. The advantages of this design was that its structural strength was typically 15 times greater than a prism shaped enclosure and furthermore rigidity was equal at all points. The fact that the enclosure was round also meant that internal standing waves were dramatically reduced. The Monitor also used the finest tweeter and woofer and in keeping with Israel Blume's philosophy, the crossover was very pure and simple using only the finest tested components. While his first creation received acclaim from reviewers, there were three factors Israel Blume felt he had to address before he could find acceptance in the marketplace with his dream speaker. Firstly, it had to more accessible aesthetically (which many felt the cylindrical enclosure was not), secondly it had to be less expensive to build (the Monitor was exceptionally labor intensive) and finally the speaker had to able to be driven by single ended tube amplifiers (which the Monitor could not).

Coincident Reference Room

Coincident Reference Room


The result of two years of design work culminated in the development of the Troubador speaker. Using extensive computer modeling, Blume was able to duplicate the sonic properties of a cylindrical enclosure but with the use of non-paralleled flat plane walls. The most significant advantage of this type of enclosure is the elimination of internal standing. In a further attempt to eliminate the sonic contamination of loudspeaker enclosures, Blume uses enclosure tuning techniques. Instead of using resonant enclosure materials and then attempt futilely to damp them out, all Coincident enclosures are constructed from inherently non resonant materials that need no damping. The enclosures are then tuned to a high fundamental resonant frequency that is sonically undetectable.

The culmination of this arduous, painstaking journey has yielded a series of loudspeakers that offer unprecedented performance in each price category. From the Triumph Extreme to the Pure Reference Extreme, Coincident speakers sound better and are better constructed than competing designs at the same price.

Designer Israel Blume has recently realized his goal of building a true reference speaker that encompasses the entire criterion he initially enumerated. That speaker is named the Pure Reference Extreme. This speaker is the most musically authentic loudspeaker from the company and is capable of reproducing the musical signal fed with very high accuracy. Naturally this lead to more development work as amplification driving his speakers was also very critical for accurate music reproduction.


Coincident began designing and building amplifiers in The Coincident Speaker Technology Total Victory IV | Frankenstein MkII2001 with the introduction of the MP 300B SET mono blocks and the MIP 300B integrated version of the MP 300B. Both were highly acclaimed and offered build quality and performance unmatched by any other. An intense R & D program and countless hours of aural evaluation lead to the company's breakthrough M300B Frankenstein amplifiers in 2005. The design goal of the Frankensteins was to manufacture the finest amplifier in the world which meant it had to be a single ended 300B design. The fact that most commercially available loudspeakers were not able to be driven by the purest, low powered amplifiers was of no concern since all Coincident models were ideally suited to this mode of amplification and some other well designed speakers were as well. The Frankensteins were designed and manufactured with no cost restraints. The goal was simple -- it had to be the purest, most transparent, neutral amplifying device in existence. While the goal was simple, the realization of it was not. It took Blume over three years of intense research and development, numerous prototypes and literally thousands of hours of auditioning before the dream was achieved. The M300B Frankenstein amplifiers may sell for a relatively modest price but there is no competing amplifier that is better constructed or compares sonically at any price.

Enter The Dragons

The Coincident Speaker Technology Total Victory IV | Frankenstein MkII

While Blume freely acknowledge that the Frankenstein amplification offered the company's purest sonic reproduction available, Coincident felt there was a need for a high power amplifier that was capable of driving any speaker no matter how difficult a load. However, not only must this amplifier be so capable it had to come as close to the sonic purity of our reference Frankensteins as possible. The result is the Dragons. They are constructed exactly as the Frankensteins using the same components, circuit philosophy and state-of-the-art construction but instead of being single ended triode it uses a pair of high powered 211 DHT tubes operating in push-pull mode. To approach the sound of the Frankensteins yet offer "unlimited drive ability", the Dragons had to use DHT output tubes in push-pull. The driver tube had to be DHT as well and none better than the 300B. The end result is claimed to be an amplifier that sounds like a 500 watt brute yet with 95% of the Frankenstein's finesse.


While there is no shortage of line stages available, Israel Blume felt that absolute transparency of the best passive units operating was his design goal. Because of this, Coincident recommended the avoidance of active line stages whenever possible. Thus the company set out to overcome the deficiencies of existing active preamplifiers because of what they felt were inherent advantages of these designs. The Statement Line Stage involves a new way of thinking of preamplification design. Blume felt that existing circuit topologies have proven to be inadequate whether they were solid-state or tube based. A completely new paradigm had to be created. At the heart of this new design was the 101D directly heated triode tube. It has been recognized as the most linear amplifying devise ever made.

To fully exploit the inherent superiority of the 101D, Blume knew it would take a state-of-the-art design utilizing only the finest components executed to the highest standards. After years of research and experimentation, the Statement Line Stage was born. The unit, outside of the tubes, is all transformer coupled, from the input, volume control and right through to the output. There are no capacitors in the signal path and the power supply is huge (41 lbs). The end result is a line stage that is almost noiseless, not prone to hum and passes the musical signal with virtually no perversion. For the company it represented a sonic breakthrough since it combined the best qualities of passive designs with the inherent advantages of an active preamplifier.

The Coincident Sound

Mr. Blume is often asked, "What do Coincident Speakers sound like?" Their answer, "We try our hardest to make them sound like nothing. The theoretically perfect audio component would sound like nothing. It would simply transmit the signal it is being fed with no alteration, enhancement, subtraction or distortion. Our goal with all Coincident models is for them to pass as much musical information with the least possible coloration. Coincident speakers do not editorialize or attempt to glamorize the sound.

For example, there is no intentional boosting of the midbass to provide the illusion of more bass, nor the rolling off of the high frequencies to make the resultant sonics more pleasing. Coincident Speakers are designed to be as musically accurate as possible. We attempt to create an open window on the musical event, with nothing interfering between the music and the listener. Consequently, Coincident Speakers are very revealing of the musical source, the room in which they are placed and the ancillary components used. It must be emphasized that high resolution does not connote low musicality. On the contrary, the better a component is at revealing the information it is sent, the more accurate and by definition, the more natural it will be since it will closer approximate the live music listening experience." Coincident Speaker Technology is proud to still state that unlike the majority of current speaker companies (i.e. Revel, Aerial, Von Schweikert, Red Rose etc.) all its speaker models are designed and completely manufactured in Canada.

More Details About Coincident Speaker Technology

All the crossovers are meticulously hand soldered in Canada, matched to within 1% tolerances using the finest Canadian and American components. Coincident does not use poor quality overseas-sourced crossovers that are pre-built and cost a couple of dollars. The price of one capacitor used in a Coincident speaker crossover exceeds the cost of these entire crossovers that are finding their way into very expensive competing speakers.

All internal wiring is manufactured in Canada using American 6N copper. Only the finest Canadian dielectrics like polypropylene and air Teflon are used. Coincident Speaker Technology's wire is very expensive to manufacture and labor intensive to terminate. There is no use of off shore cables that Blume feels are sonically inferior and costs only a few pennies.

All Coincident speaker enclosures are meticulously CNC and hand crafted at their facilities in Canada. Only the highest quality Canadian made hardwood MDF is used, all wrapped with furniture grade cherry wood veneer that is carefully pressure applied on both sides of the board. Coincident chose to build their enclosures in Canada to ensure high quality.

All the drivers of Coincident speakers are sourced from only state-of-the-art manufacturers such as Scan-Speak, Vifa and SEAS. Coincident does not use any knock-offs cheaply manufactured drive units that are copies of the above noted brands. Only the very best drivers sourced from the finest manufacturers are chosen.

Coincident Speaker Technology is committed to providing the high-end audiophiles with the finest value components in the world. Coincident, therefore, will never sacrifice quality. No detail is considered too trivial if it enhances the sonics or build quality of their products. "Coincident will never offer an inferior product in pursuit of greater profits" says the owner Israel Blume.

Israel Blume continues by saying "Coincident components exist for only one purpose: to provide the discerning music lover with the finest sounding, best built products that above all else, enhances the musical experience."

Company Information

Coincident Speaker Technology
19 Strauss Road
Ontario, Canada L4J 8Z6

Voice: (905) 660-0800
Fax. (905) 660-1114
E-mail: [email protected]





TAS 2013 Award | Editor's Choice Awards

Pure Reference
Editors Choice
The Absolute Sound
TAS 2013


Super Victory
Editors Choice
The Absolute Sound
TAS 2013


Partial Eclipse II
Editors Choice
The Absolute Sound
TAS 2013


M300B Frankenstein Amps
Editors Choice
The Absolute Sound
TAS 2013


Coincident Speaker Technology • Pure Reference Extreme Loudspeakers

A genuinely high-end, full-range partner for low-powered amps -- and much more besides.

by Roy Gregory | February 17, 2012

There's an old adage, at least in this part of the world, that it's easier to build efficiency into a speaker than power into an amplifier, yet it's a pearl of wisdom that is all but ignored by speaker and amplifier manufacturers alike. Of course, it comes with the considerable caveat that (where speaker enclosures are concerned) size can't matter, but, with that literally not-so-small proviso, it's a philosophy that has a lot going for it -- though like most such sayings it's somewhat simplistic. Even so, let's just dwell on the subject of efficiency for a moment or two.


Price: $26,800 per pair.
Warranty: Five years parts and labor.
Coincident Speaker Technology
19 Strauss Rd.
Thornhill, Ontario, Canada
L4J 8Z6
(905) 660-0800






If we consider a hi-fi system's efficiency in terms of its ability to convert electrical power into acoustic output, then the results are pretty lamentable. Even horn systems with three-figure sensitivity score pretty poorly in this regard, so imagine what happens when you start building a speaker system with diminutive internal dimensions and still insist on extended bandwidth; not only does the sensitivity plummet but the impedance characteristic (and thus the load seen by the amplifier) turns something cruel. The end result is a loudspeaker that demands both considerable power and significant load tolerance.

Read complete review

TAS 2012 Award | Editor's Choice Awards


Pure Reference
Editors Choice
The Absolute Sound
TAS Golder Ear Award 2011 - The Absolute Sound- Pure Reference Extreme - Coincident Speaker

Super Victory
Editors Choice
The Absolute Sound
TAS Golder Ear Award 2011 - The Absolute Sound- Pure Reference Extreme - Coincident Speaker

Partial Eclipse II
Editors Choice
The Absolute Sound
TAS Golder Ear Award 2011 - The Absolute Sound- Pure Reference Extreme - Coincident Speaker



2011 Saw Another Year with Many Prestigious Awards
Garnered by Coincident

Pure Reference
Golden Ear Award
The Absolute Sound
TAS Golder Ear Award 2011 - The Absolute Sound- Pure Reference Extreme - Coincident Speaker

Editor's Choice

The Absolute Sound

Editors Choice The Absolute sound - Pure Reference Extreme - Coincident Speaker
High End Audio
Class A

Super Victory

Editor's Choice
The Absolute Sound

Editors Choice The Absolute sound - Pure Reference Extreme - Coincident Speaker

Statement Phono
Blue Note Award
Enjoy The Music
Blue Note Award - Enjoy The Music - Statement Phono Stage

Highest Recommedation Award


Highest - Stereomojo Award - Statement Phone Stage - Coincident Speaker

High End Audio
Class A (lower)

Statement MC Step Up Transformer
High End Audio
Class A

Coincident Pure Reference Extreme Loudspeaker
$ 26,800

by TAS Issue 215

View printed review

Coincident Speaker - Puer ReferenceThe Coincident Pure Reference Extreme (CPRE) may be the most accurate and true-to-life loudspeaker on the market today. It's actually the opposite of the MBL. It does not recreate a concert, it does not beautify recordings; and it looks relatively ordinary. Considering all the MBL does right, the Coincident does the same things more realistically and correctly. It is a thinking man's loudspeaker that speaks the truth whether or not you want to hear it. When I say more realistically, I mean that literally. The imaging is the best in the business. It's exactly what the microphone(s) picked up and it replicates what the recording engineer intended you to hear. Let me be clear: The Coincident allows you, for the first time, to experience that actual craft of the engineer. Countless examples of crappy, thin, or compressed recordings are deconstructed by the Coincident and reassembled in a more realistic fashion. It's as if other speakers smear the sound. And it's all presented, phase perfectly, in a broad array across your room-an immersive Holodeck of sound.

The CPRE is a three-way design that functions more like a two-way with a subwoofer. Its super-fast ceramic Accuton mid- and high-frequency drivers cover the ground from 100Hz to 27kHz. The woofers are tonally correct with perfect pitch and definition. If you are accustomed to midbass (chesty) exaggerations, you'll have to rewire your thinking. Once you do, you'll never go back. The crossover is simple and first-order. The sensitivity is 94dB, and the load is tube-amplifier-friendly.

Over the years, TAS Executive Editor Jonathan Valin has “ticked” numerous Magneplaners as the best bang-for-the-buck in high-end loudspeakers (and does again in this GE-Ed.). I'm going to add the Coincident Pure Reference Extreme as one of the very best performance-for-dollar products in the ultra-high-end market today. The CPRE is downright magical with low-output triode amplifiers, but is also surprisingly realistic and vivid with big solid-state amps. Not to mention, it's out of this world with vintage Heathkits and Fishers. The CPRE is on of the most versatile and realistic loudspeakers available today. (Reviewed in Issue 209)


We are now excited to introduce the MK. II version of the highly acclaimed Dragon amplifiers. The improvements include:

1. Dual power transformers in place of the previously used single unit. The new transformers individually possess the capability of powering the amplifier. In tandem, they are coasting only using less than 25 % of their rated capabilities. The result is a far cooler operating amplifier, thereby improving reliability and long term
stability. Additionally, the Dragon is now virtually noiseless. It is incredibly quiet which is a remarkable feat for an amplifier this powerful operating at such high voltages. Sonically there is an improvement from top to bottom. The bass is tighter, deeper and punchier. The mids and highs are more transparent and the soundstage more expansive. Due to the reduction in noise, overall revelation of low level detail is enhanced.

2. Chassis Rigidity - To accommodate the dual transformers of the MK. II Dragons, the chassis has been enlarged by 20%. The amplifiers are now 2" wider and 2" deeper and 1" higher. They now weigh 85 lbs, which is 20 lbs heavier than the previous model. The chassis is now more rigid which results in the virtual elimination of chassis induced resonances. The MK. II now utilizes 6 ceramic isolating feet to stabilize the unit.

3. The standard supplied 211 tubes will now be the exceptional Shuguang Pevane. They represent a marked sonic improvement over the previously supplied standard Shuguang. The Pevane is also more durable and reliable and runs 15% cooler.

4. AC ground lift is now included. This switch conveniently eliminates hum created by AC ground loops.

The MK. II Dragon is now the finest sounding, high power amplifier in existence. Its purity is within a hair's breath of the finest SET 300B amplifiers (the Frankensteins) yet its power delivery is awe inspiring. It also runs cooler and is exceptionally quiet.

The purity, transparency and continuousness of a DHT SET but with the power, explosive dynamics, weight and impact of a huge push pull pentode amplifier - sounds mutually exclusive, not any longer. The 211PP Dragon mono amplifiers are such a creation. These amplifiers are absolute state of the art in terms of components selected, circuit design and execution and construction quality. This is unique among high power, push pull DHT triode amplifiers. There has never been a high power, DHT amplifier built to this standard with sonic performance at this level. The Dragons are capable of driving even the most difficult speaker loads.

Features include:

  • The finest 6N copper interstage, output and dual power transformers
  • No coupling caps in the signal path
  • Tube compliment- 6EM7 super tube for input- So much current capability it has its own power supply
  • 300B Driver Tube for utmost purity ( no pentode tubes used in this DHT design)
  • Dual 211 Shuguang Pevane output tubes in a push pull configuration which dramatically lowers distortion and provides huge power reserves. (over 120 watts of peak power- 80 watts continuous- sounds more like 150 watts)
  • Teflon caps use in cathode bias circuit
  • Power supply caps are all 1500V polypropylenes
  • Highest quality discrete resistor potentiometer permit the direct connection of a CD player thereby obviating the need for an expensive line stage
  • Binding posts are Coincident 6N copper, .25" solid post
  • Auto bias
  • All resisters, red metal film, 1% and none less than 2 watts
  • All meticulously hard wired


211pp Dragon MK. II Mono Amp
Output Power: 75w (Triode) / Push-Pull Class A
Output Impedance: 8ohm,16ohm
Frequency Response: 20hz-20khz ±1db
T.H.D.: <1%, 20hz-20khz (Ref. Output)
Input Sensitivity: 1v
Input Impedance: 100kohm (Rca)
S/N: >90db 
Tubes: (6EM7×1, 300B×1, 211×2) / Channel
Power Requirement: Ac 115v Or 230v±5% 50/60hz (Selectable)
Dimension: 270 W x 189 H x 520 D (mm) 
Gross Weight: 41 Kgs
Net Weight: 38.5 Kgs

$10999 US /pr. includes freight.
$ 9999 US/pr. when purchased with any Coincident speaker.


Coincident's Reference System:

Featuring Double Pure Reference Extremes

"This system points out some significant flaws in my own. I would like to adopt it as
My Reference in Absentia
. Listening to my familiar music on CDs and your LPs had a profound impact I will be processing the experience for quite some time, I expect.

Quite simply- it was incredible.
Thank you, Israel."

Rick Becker-

Double Pure Reference Extremes




The Coincident Statement is now the finest MC step-up I've ever heard, of any type. The discovery of a new reference component is always a cause for a "celebration", though, in this case, it will have to be tempered. This is because the Coincident's degree of superiority over the former reference, the Bent Audio Silver, is quite subtle. In fact, to even initially hear the differences took numerous A/B/A/B comparisons (after basic A/B comparisons failed for me).

Read full review at



The "Extreme" is simply the "Original" Pure Reference, with the exact same drivers and crossovers, but in two separate cabinets (a mini-monitor and a subwoofer), instead of one large floorstander. With the monitor sitting directly on top of the subwoofer (at the front), the Extreme is around 12" shorter, though its subwoofer takes up around 50% more floor space, because it is 4" wider. The price for the Extreme is $ 26,000, compared to $ 22,000 for the Original.

Read full review at

Passive vs Active Preamps

Passive Preamp- In essence is merely a volume control designed to attenuate the signal going from the source (usually a CD player) to the amplifier. Since it is passive, it has no inherent gain because it has no active components (tubes or transistors) in the signal path.

The quality (sonic purity) will be largely dependant on the volume potentiometer used. The finest discrete resistor pots will sound more accurate than a variable one, for example, since the signal travels through only one resistor at any given setting and is therefore not dependant on volume position as is the case with a variable pot. Many believe that transformer volume controls can be superior to even the best discrete resistor pots, since the TVC is inherently passive while the latter still requires the audio signal to traverse a resistor. The TVC is more costly to properly implement since the best transformers are very expensive.

Type, length and quality of the internal wire will also affect the sound as will the connectors being used. The inclusion of a selector switch will compromise the ultimate transparency of the sound to a greater or lesser degree compared to a passive eschewing this switch.

Active Preamp- Not only controls the volume of the source component but since it uses active devices (tubes or transistors) in the signal path it has gain. The active preamp inherently has many components in the signal path compared to a passive. It uses all the components of the passive with the addition of a power supply, capacitors, resistors, gain devices, and means by which all these parts are connected.

Logic would seem to dictate that the active preamp must adulterate the signal to a far greater degree than the passive by virtue of all those additional components.Further, since the active has the additional disadvantage of requiring a power source, tubes or transistors it must not only impose far greater noise, it is also more costly and inconvenient to use. Why would anyone want to use the active in a system? Theoretically, it would seem nonsensical to use anything but a passive preamp.

The Imposition of the Real World –

Passive Preamp - While it is inherently simpler in design with no active components in the signal path, it is highly susceptible to component interaction. The affects of the IC cable (impedance, capacitance and resistance), the source resistance which is the combination of the potentiometer and the actual source and the input impedance of the amplifier are all critically important in potentially altering the audio signal from source to the ultimate sound being heard.

The length of the cables between the source and passive and then to the amplifier must be strictly attended to. Too long a cable and roll offs at both frequency extremes will occur. Impedances between the volume control and the imput impedance of the amplifier must be compatible in order to avoid sonic degradation. Furthermore, since a passive has no gain, the output voltage of the source component must be sufficient and the amplifier and the speakers need to be of high sensitivity or not enough ultimate volume can be achieved.

The purest, simplest but admittedly most inconvenient method of passive attenuation is to have discrete resistor pots installed at the amplifier input. This method avoids the extra cable interaction and achieves the desired amplifier input impedance.

To summarize, in order for a passive preamp to work properly the following conditions must be met:

1. Source component must have sufficient ouput voltages;
2. Short, low capacitance cables must be used between the source to the passive and from passive to the amplifier;
3. Output impedance of the passive's volume pot should be low (less than 25k) while the input impedance of the amplifier should be sigificantly higher (100k);
4. Amplifier's input sensitivity should be high (minimum of .75v for full output).
5. Speakers should be high sensitivity (minimum of 90db).

If even one of the above conditions is not adhered to, passives will offer highly compromised sonics. However, when all of the above conditions are met, there are very few active preamps on the market that will yield better sound overall. For an active to provide superior sound, will require an amazing unit designed and executed to the highest level. (translation- it will not be cheap- but do not confuse excessive price with high performance- however high performance will be expensive).

Active Preamps - Due to the use of a myriad of components in the signal path, most active preamps severely color the sound. The signal entering them rarely resembles the sound exiting them. Theoretically, an active preamp should emulate a straight wire with gain. It should be as pure and transparent as the finest passives in an optimized system yet offer the benefits of gain and nonsusceptibility to component or cable interaction. This task would seem impossible to fully achieve and arguably no active preamp currently available has been completely successful in its accomplishment. The realistic goal of an active preamp is to provide sound with all the advantages inherent in the design with drawbacks that are so minor as to wither into insignificance when viewed in its totality. Achieving this objective requires the following:

1. The finest passive and active components available connected with the shortest signal paths possible;
2. A power supply that is impervious to voltage fluctuation or current demands;
3. The finest form of signal attenuation;
4. The purest gain devices;
5. Low output impedance;
6. A highly rigid chassis that is not prone to resonances.

The inherent practical advantages of an active over a passive is that due to output buffering, interaction between the source, connecting cables and amplifier input impedance ceases to be an issue. Further, due to added gain, much greater flexibility in system assembly is possible.

The other huge advantage presented by an active line stage is that it amplifies the source signal to a higher level, unlike a passive design which has no gain, so that the power amplifier is able to more accurately pass this signal to the speakers. This is similar to what occurs when inserting a moving coil transformer or head amp into a low gain phono stage. The low level cartridge signal becomes amplified so that the phono preamp can transmit this incoming signal more accurately to the amplifier. While the system now has an extra component in the signal path which would intuitively create the impression that purity would be compromised, the opposite results- greater fidelity is achieved. Not only is the sound more dynamic, harmonically more complete with superior rendering of the frequency extremes, there is a noticeable enhancement in detail retrieval.

Coincident has up to the advent of our Statement Line Stage recommended the use of the best passives when all the system conditions were optimized. The sonic compromise inherent with all previously auditioned active units in terms of imposed colorations were too obtrusive to ignore, despite their other advantages.

Coincident Statement Line Stage -

All the requirements mentioned above to create the superior active preamp have been met. The end result is an active line stage that is virtually as pure and transparent as not only the best passives but as accurate as going directly from the source component to the amplifier using the finest 1m interconnect. The sonic leap in dynamics, weight, impact and punch as well as full extension at both frequency extremes is dramatic.
The enhancement of musical enjoyment wrought by the insertion of the Coincident Statement Line Stage into an audio system is of enormous proportion. As reviewers and owners of the unit have confirmed, the superiority of the Coincident over passives and existing active preamps is not subtle. A short audition is all that is required to hear this level of advancement.


300B Tubes For Frankenstein Amplifiers

As of April 15/ 2012, Frankenstein and Dragon amplifiers will be supplied with Shuguang Psvane clear bottle 300B tubes as standard.

The finest 300B available is the Shuguang Treasure Black Bottle. Not only are the sonics the best we have heard, we have not experienced a single failure in the field. We have not heard a superior sounding tube, nor one that is more reliable. Coincident supplies matched and tested pairs.

We are hesitant to recommend any of the mesh plate 300Bs since they tend to be prone to microphonics due to the inherent resonant nature of their internal structure. We also have stopped recommending KR 300Bs, despite their superb sound, due to their poor reliability and the manufacturer's reluctance to honor their warranty.

If anyone has any questions or comments about 300B tubes in the Frankenstein amplifiers, feel free to contact us.


VIDEOHIFI interviews Coincident Speaker's Israel Blume

Coincident Speaker Technology is proud to still state that unlike the majority of current speaker companies (i.e. Revel, Aerial, Von Schweikert, Red Rose etc.) all its speaker models are designed and completely manufactured in Canada.

All the crossovers are meticulously hand soldered in Canada, matched to within 1% tolerances using the finest Canadian and American components. Coincident does not use poor quality Asian sourced crossovers that are pre built and cost a couple of dollars. The price of one capacitor used in a Coincident speaker crossover exceeds the cost of these entire crossovers that are finding there way into very expensive competing speakers.

All internal wiring is manufactured in Canada using American 6N copper. Only the finest Canadian dielectrics like polypropylene and air Teflon are used. Our wire sounds the best and is very expensive to manufacture and labor intensive to terminate. Other high end speaker companies use off shore cable that is sonically inferior and costs pennies.

All Coincident speaker enclosures are meticulously CNC and hand crafted at our facilities in Canada. Only the highest quality Canadian made hardwood MDF using furniture grade cherry wood veneer which is pressure applied on both sides of the board is utilized. Having our enclosures made in China, as most other speaker manufacturers, would save 80%-90% of the cost. However, we would not even think of doing this since the quality of workmanship simply does not compare. Inspect a Coincident enclosure with those made in China and the difference is painfully obvious. Coincident will never sacrifice quality for profits.

All the drivers of Coincident speakers are sourced from only state of the art manufacturers such as Scanspeak, Vifa and SEAS. Coincident does not use any Chinese manufactured drive units that are knock offs of the above noted brands. Many high end speaker companies no longer use the expensive, best sounding drive units made by these European companies, instead opting to use inferior sounding and incredibly cheap (costing as little as a couple of dollars) Chinese units that are almost visually identical. The consumer is fooled into believing he is buying an expensive speaker using Scanspeak drivers when in reality the drivers are very cheap poor quality units that only physically resemble those drivers.

Coincident Speaker Technology is committed to providing the high end audiophile the finest value loudspeakers in the world. Coincident, therefore, will NEVER sacrifice quality. No detail is considered too trivial if it enhances the sonics or build quality of our speakers. Coincident will never offer an inferior product in pursuit of greater profits. Therefore, none of our speakers will be made in China nor will any of our models use inferior components because they are inexpensive to purchase and will increase our profit margins at the expense of quality. Coincident speakers exist for only one purpose: to provide the discerning music lover with the finest sounding, best built loudspeakers available anywhere near their selling price.



The Coincident Sound

We are often asked, "What do Coincident Speakers sound like ?" Our answer, "we try our hardest to make them sound like nothing". The theoretically perfect audio component would sound like nothing. It would simply transmit the signal it is being fed with no alteration, enhancement, subtraction or distortion. Our goal with all Coincident models is for them to pass as much musical information with the least possible coloration. Coincident speakers do not editorialize or attempt to glamorize the sound. For example, there is no intentional boosting of the midbass to provide the illusion of more bass, nor the rolling off of the high frequencies to make the resultant sonics more pleasing. Coincident Speakers are designed to be as musically accurate as possible. We attempt to create on open window on the musical event, with nothing interfering between the music and the listener. Consequently, Coincident Speakers are very revealing of the musical source, the room in which they are placed and the ancillary components used. It must be emphasized that high resolution DOES NOT connote low musicality. On the contrary, the better a component is at revealing the information it is sent, the more accurate and by definition, the more natural it will be since it will closer approximate the live music listening experience.

Those seeking to replicate the thrilling experience of listening to live music will greatly appreciate the "Coincident Sound". Our reference standard is live music and our goal is to get as close to the sound of real instruments playing in a real space, as present technology will permit.


Why Biwire?

Biwiring is when a loudspeaker has separate connections to the bass and the treble/midrange. The idea is to use individual speaker cables to each section. Besides being profitable to cable manufacturers, since the user is required to purchase double the amount of speaker wire, are there any sonic benefits to this arrangement?

The answer is yes and no. Yes it is a benefit for loudspeakers that are not properly designed. In speakers where the crossover sections are interdependant and not adequately isolated from one another, biwiring will likely offer a sonic benefit. However, in speakers, (like all Coincident models), that have all the crossover sections, (high pass, low pass etc), completely separated and isolated from one another and are run to the binding posts, (as opposed to being interconnected between sections and wiring all the hots and grounds to the speaker's binding posts), biwiring affords NO sonic advantage and may actually involve a sonic degradation depending upon the speaker cable used.

Coincident recommends biwiring only in those cases where a consumer has the intention of biamping his speakers. A biwiring option will be necessary if one is biamping a system, meaning separate amplifiers will be powering different drivers. Otherwise, biwiring is not only totally unnecessary and a waste of money, but a pain in the derriere.

Mirror Imaged Side Firing Woofers - Advantages

Unlike the majority of other speaker companies that place their woofers on the front of their speakers, Coincident mounts their woofers on the side of the enclosures in a mirror imaged configuration.This is done because there are 3 distinct advantages with NO downside.

1. Elimination of Diffraction Effects -

Since the largest drivers,(the woofers), are mounted on the side of the enclosure, the front baffle can be made as narrow as the smaller midrange drivers, thereby eliminating diffraction effects, (which are responsible for impairing image width and creating high frequency smearing).

2. Flexibility of Speaker Placement -

Because the side firing woofers are mirror imaged, there are two positions to avoid room standing waves - woofers aiming to the inside or to the outside. In a room devoid of standing waves, (a very rare phenomenon), there would be absolutely no sonic difference whether the woofers were firing inside or outside, (so long as there is sufficient distance to the side wall in the case of outside firing). This is so because the crossover frequency to the woofers is so low, (typically 125 hz), where the wavelengths are very long, (in the range of 9 ft). This means that the woofers can be placed a distance as much as 9 ft away from the midrange units and still achieve seamless driver integration.

The Stereophile Show 2001 provides a dramatic real world illustration of the benefits of mirror imaged side firing woofers. The demonstration rooms were plagued with a standing wave centered at 100 hz ( elevated in amplitude by 12db!). This was the case when the Total Eclipse woofers were firing to the outside and as other exhibitors experienced, when the woofers were front facing . However, when the woofers aimed to fire to the inside, the room standing wave was avoided and flat frequency response to below 30 hz was achieved.

3. Simulation of Steep Crossover Slope-

Since high frequencies are directional, (low frequencies are not), aiming the woofers to the side of the listening position causes out of band high frequency information to be attenuated, thereby simulating an acoustical high pass filter. Therefore, the electrical first order crossover (chosen for reasons of purity and phase coherency- attenuates out of band frequencies at a rate of 6db per octave), of Coincident speakers act more like an acoustical third order slope (with its advantages of steeper attenuation- 18db per octave- of unwanted out of band high frequencies), but with no sonic penalty since no additional electrical components are added to the signal path.

Amplifier Power - How Much Is Enough?

This is a question that is asked almost more frequently than any other.As with most issues in audio,the answer is complex and depends upon the following:

1. Speakers being used- Sensitivity and the impedance curve being critical.

2. Personal preferences of the listener- Type of music listened to and at what output levels.

3. Size of room - To fill a larger room will take proportionally greater amplifier power.

Acoustical output is dependant upon the power of the amplifier used and the efficiency with which the speaker being driven can transform the electrical signal into sound.The term "sensitivity" is a speaker measurement that reveals how much sound (in decibels) is produced at a specified distance, (usually 1 meter), from the speaker when it is fed a specified input signal, (usually 2.83 volts which is equivalent to 1 watt into 8 ohms). Therefore, a more sensitive speaker that has a flat, benign impedance curve (of 8 ohms or more), will produce greater acoustical output with the same specified amplifier power than a less sensitive speaker or an equally sensitive speaker that has a reactive, low impedance modulus. For example, a speaker that is 3 db more sensitive than another will require only half the amplifier power to generate the same sound output.

If a speaker has a sensitivity rating of 85 db @1 watt - 1 meter, to achieve an output of 88 db would require double the amplifier power or 2 watts.91 db output would take 4 watts. For 100 db output of sound, would require 32 watts of power. And if this speaker was rated at 4 ohms, a 64 watt amplifier would be needed to produce 100 db.

By contrast, a 94 db sensitive speaker would require only 4 watts to achieve a 100 db output level. Since most listening in the home environment is undertaken at 85 db or less, it can be clearly seen that only a fraction of a single watt of amplifier power is all that is required for the vast majority of listening. A 100 db output, which is loud, still needs only 4 watts of power to attain. However, it must be emphasized that while listening at an average level of 100 db, during musical passages that are very dynamic with lots of low bass content, many hundreds of watts may be necessary, (albeit for only the duration of a millesecond), to avoid amplifier clipping.

The above example clearly demonstrates how significant the sensitivity and impedance curve of the loudspeaker is upon determining how much amplifier power is necessary.

Personal Preferences of the Listener-

As the above example illustrated, higher listening levels requires greater amplifier power. Therefore, the output levels the listener chooses to listen at, will be critical in determining the amount of power that will be satisfying. The listener who is content at levels of 80 db will need a fraction of a watt while someone who likes to listen at 105 db will be using almost 260 times more power!

Of equal importance is the type of music enjoyed. Full orchestral music, for example, is very demanding on amplifier power in order to reproduce the exceptionally high levels of dynamics coupled with very low bass content (which uses enormous amounts of power). Conversely, chamber music, light folk etc. is usually listened to at lower SPLs and its musical content requires far less amplifier power to accurately reproduce.

Furthermore, some listeners prefer a punchier, gutsier sound presentation than others whose priorities lie more in the area of detail retrieval, imaging etc. For some, visceral impact is mandatory or at least may represent much more of a priority than it is to others. These personal predilections must be factored into the equation of how much power is sufficient.

Room Size -

All things being equal, the larger the room, the more amplifier power required to fill it. The sensitivity rating of a speaker is the measurement of acoustical output at a distance of 1 meter. The further away the listener is from the speaker, the lower the sensitivity. Therefore, a speaker producing 94 db from 1 watt of amplifier power at a distance of 1 meter will produce less sound pressure when the listener is 2 meters away. For a speaker to energize a room of 1000 cubic feet, for example will require significantly less amplifier power than to do the same in a 2000 cubic foot space. As a real world example, at the recent 2001 CES, Coincident demonstrated in a hotel suite of 1872 cubic feet using a 24 watt amplifier. To achieve similiar sound pressure levels and bass impact in another space of 7200 cubic feet, required 3x the amplifier power.With the same 24 watt amplifier in the much larger room, the sound was not as weighty, impactful or as dynamic as it was in the aforementioned smaller environment.


With easy to drive speakers, like Coincident, many are afforded the opportunity of using low powered amplifiers like SETs with completely satisfying results. For those in a compact room, who listen at moderate levels to jazz , light rock, folk etc, then the inherent superiority of the best SETs will be appreciated. That is not to suggest that SETs are for everyone.They are decidely not. If your musical tastes are focused on big orchestral music, heavy rock, etc., and you listen at high spls in a large listening space, then small tube amplifiers may not be your sonic cup of tea. It would be recommended that a more robust amplifier be used.

Loudspeaker Impedance And Amplifier Matching

Solid State Amplifiers:
With transistor amplifiers ,the amp's output impedance is never matched to the load it drives.The lower the load impedance ,the closer it comes to a true impedance match , because the output impedance of a solid state amp is very low - typically a fraction of an ohm.This helps explain why (all things being equal- and the amplifier has sufficient current capability)4 ohm speakers produce greater acoustical output than 8 ohm speakers.The lower impedance speaker offers less resistance to current from the amp.The transistor amp sees less resistance into 4 ohms , therefore its output stage delivers more current.

Tube Amplifiers:
A tube amplifier's output stage(s) are totally different. A true match between the load impedance and the plate impedance ( or plate - plate impedance of a push - pull tube output stage) is never absolutely possible.The tube's plate impedance is typically exceptionally high
( thousands of ohms.) Therefore ,even a tube output transformer ( which becomes necessary to lower the plate impedance so that a typical speaker can be driven) with a primary impedance of 3K - 8K ohms will not closely approach this match. Therefore, it can be seen that the operation of tube versus solid state outputs is reversed. In the case of transistors, impedances cannot be matched due to the ultra low output impedance of the amp ,while with tubes, the match cannot be achieved because of the very high output impedances.

The output transformer in a tube amp lowers its impedance to a level where speakers can be made to operate and extract power from the driving amplifier. The output transformer is designed with a given ratio between the number of turns of wire in the primary and a nominal secondary impedance. For example, if we connect an 8 ohm loudspeaker to an amplifier with a primary impedance of say, 5,000 ohms and a transformer tap of 8 ohms, the primary impedance remains at 5,000 ohms and the amplifier delivers a given amount of electrical power. But ,if a 4 ohm speaker is connected to this amplifier, the output volume will diminish because the 4 ohm load causes a reduction of the primary winding impedance. This reduction means the amp's output transformer presents a poorer match to the plates of the tube output stage than it previously did.

On the other hand, if a 14 ohm loudspeaker is connected to the same 8 ohm tap, the primary winding's impedance is increased. The transformer represents only a ratio of turns and its impedance is determined by the load connected to it. Because the transformer's impedance has increased, it comes closer to matching that of the plate circuit. The result is greater output volume from the speaker.

In conclusion, a tube amplifier will produce more output ( greater voltage delivery) into higher impedance loads. Therefore , a 14 ohm speaker will be much more efficiently driven by a tube amplifier than will a 8 or 4 ohm speaker. This becomes of critical importance when using OTL or single ended triode tube amplifiers when available output power is low and amplifier output impedance is very high.

Available Options for Coincident Speakers



    Biwire Terminals- (available on all Coincident models)
    Not recommended (unless one intends to biamp) since it involves no sonic benefit. Will be available for those who insist.

    Price: $250 US /pr.

    Cables- What is Important?

    I would like to address some technical points applicable to speaker cables in general and how they apply to the Coincident CST1 and TRS speaker cables in particular.

    It is commonly mentioned that capacitance is an important factor in speaker cable performance. This is incorrect. A speaker cable's capacitance is in parallel across the power amp output, not in series with the signal. The musical signal does not go through the cable's capacitance to go back and forth between amp and speaker. Therefore, speaker cable capacitance has very little deleterious consequences upon the accurate transmision of music along the length of the cable.

    On the other hand, resistance, and even more significantly, inductance, both have very profound affects on the musical signal.

    The resistance of a cable is determined by its cross sectional area and by the material of the conductor. The larger the gauge, generally the lower the resistance. Low resistance cables have a low propensity to effect frequency response deviations with a given loudspeaker while high resistance cables have a higher propensity to do the same. The sonic affect of the cable will be dependant upon the impedance characteristics of the loudspeaker. A high, flat impedance speaker will cause little or no frequency response deviations (even with a high resistance cable), but with a loudspeaker that has impedance dips, a high resistance cable will superimpose more of a frequency response deviation.

    Self inductance is determined by the physical intimacy of the 2 conductors of opposite polarity (hot & ground). The more intimately intertwined the conductors ,generally speaking ,the lower the inductance.Without getting too involved,it is safe to state,that the lower the inductance, the more extended the high frequencies.The higher the inductance ,the more rapidily will the high frequencies begin to roll off.

    Both resistance and inductance,unlike capacitance,are critical to accurate reproduction, because they are in series with the amp and the speakers. The music must pass through the cable's resistance and self inductance.

    It is precisely for the above noted reasons that the Coincident CST1 and the Total Reference Series speaker cables ,have been designed to be low resistance and ultra low inductance and only medium capacitance.The proof of any design ,is the sonic results with a very wide range of available associated components.Our experience and those of many hundreds of Coincident cable owners would appear to substantiate that Coincident cables sound superb with virtually all components.

    Cable capacitance may be relevant in cases where circuit impedance is high.It is therefore not recommended to have high cable capacitance on the output circuit of a preamp with a source impedance of a 500 ohms or higher.The output circuit impedance of a power amp is however,very low, usually in the range of .1 to .5 ohms which is far too low to be affected by the shunt capacitance of even the highest capacitance speaker cables. The only possible exception where high speaker cable capacitance could be audible would be the case of a high output impedance preamp being mated to a very high output impedance amplifier like a Sonic Frontiers, (somewhere in the range of 6 - 10 ohms), connected to a low impedance loudspeaker.

Designed By Science Driven By Passion
391 Woodland Acres Crescent, Maple, ON., L6A1G2
Tel: 647-221-1834
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