Joseph Audio Perspective 2 Speakers, Doshi Audio V3 Stereo Amplifier and Line Preamplifier and Evolution Series Tape Preamplifier, Berkeley Reference Series 3 DAC, Aurender W-20SE Streamer, Cardas Clear Beyond Cabling

I'm surprised how many principals and designers are at this show, as opposed to local dealers and distributors—although perhaps I shouldn't be, considering that it's February and this is Florida.

In the Cardas/Joseph/Doshi room, I found both Jeff Joseph and Nick Doshi. I also found very good sound, produced by Jeff Joseph's Perspective 2 Graphene loudspeakers ($15,000/pair), which John Atkinson reviewed in the July 2018 issue of Stereophile. I won't comment on the speakers except to say that they sounded great; I'll just refer readers to JA's review.

Here, I'll focus on Doshi electronics, which I don't know as well. Specifically, I'll focus on the V3 Stereo Amplifier.

Nick Doshi is, foremost, an engineer. The son of two Indian musicians—an early memory is sitting on his mother's lap while she was singing onstage—he comes from the communications industry; he described to me a project he led involving PBS, satellites, cell phones, and the Emergency Warning System. I didn't catch all the details. Not long ago—was it 2015?—he followed his passion into the hi-fi business. He started fast: He already has two products in Class A of Stereophile's Recommended Components list.

The Doshi philosophy involves several principles: Components are overspecified to reduce thermal (and other kinds of) stress. He tries to keep things as simple as possible, with, eg, fewer stages in amplifiers. He doesn't design to a price point; rather, Doshi products "are priced according to their build." (The quote is from a Doshi marketing brochure.)

A key aspect of his approach, he told me, was to evaluate numerous designs—Doshi literature mentions a historical review of audio electronics—and choose the best approach for the particular application. That includes the choice of output device: tubes? MOSFETs?

A good example is the Doshi Audio V3 Stereo Amplifier ($20,000), a hybrid design, but not the usual sort. It's inverted relative to the norm: The output stage is tubed, with four EL34/6CA7 output tubes (two pairs) per channel. It has just two active stages, and less than 10dB of global feedback is claimed. While rated at a relatively modest 65Wpc, the circuit is heavily biased into class-A, with a claimed 50Wpc of class-A power. The literature says "it can drive virtually any loudspeaker, regardless of impedance or other load characteristics;" it was comfortable driving the Perspective 2's, which are fairly insensitive at 83.6dB(B)/2.86V/m, but otherwise, according to JA's measurements, an easy load. Doshi told me the output impedance—there's just one tap, optimized for a 6 ohm load—is 0.8 ohms. Much attention is paid to dealing with vibrations, minimizing external and internal resonances. The insides of their transformers are painted with vibration-damping paint developed to silence submarines.

Here's a feature I'd never seen before: a mute switch on the back panel, intended for use while changing cables, that blocks signal on inputs and outputs.

Also notable in the system was the $18,000 Evolution Series Tape Preamplifier, which was taking output directly from the head of a Studer reel-to-reel, which was playing the title track from Patricia Barber's Café Blue. It was a pretty thing, with styling that evokes Luxman. Doshi told me that when he was 11 years old, he drew VU meters in his notebooks. Welcome home, Nick.

Cabling was from Cardas Audio's Clear Beyond Series.

COMMENTS
Bogolu Haranath's picture

That Doshi stereo amp is the same price as ARC Ref.160S, reviewed by JA2 ........ May be JA2 could also review that Doshi stereo amp? :-) .........

Ortofan's picture

... a designer of products without being under the constraint of having to meet a particular price point.

Could Nick Doshi design a product with the performance and functionality of, for example, the Yamaha R-N803 and have it sell for about $750?

https://usa.yamaha.com/products/audio_visual/hifi_components/r-n803/index.html

https://audio.com.pl/testy/stereo/amplitunery-stereo/2984-yamaha-r-n803d

Bogolu Haranath's picture

At $750 price, it won't be Objet d'art :-) .........

Kal Rubinson's picture

Could Nick Doshi design a product with the performance and functionality of, for example, the Yamaha R-N803 and have it sell for about $750?

I wish. I've been searching for a top quality 6-8 channel analog preamp and recently heard a system (>>$1million) for which he supplied a 4 channel preamp. That whet my appetite but when I saw his website, I realized I can't play at that level.

Ortofan's picture

... you once reviewed not be suitable?
Likewise for the Meridian unit or the NAD M17v2?
Also, the McIntosh MX123 or MX170?

Kal Rubinson's picture

Deleted.

Kal Rubinson's picture

AFAIK, none of these support even one balanced (XLR) multichannel analog input, let alone 2-3. Also, aside from the P7, it is likely that they also redigitize their (unbalanced) multichannel analog input.

Still looking.

Bogolu Haranath's picture

Are you listening John Siau? :-) .......

Kal Rubinson's picture

Mebbe or mebbe not. John/Benchmark has a solution which I have used and that is to stack 3 or 4 LA4s, HA4s or, even DAC3s and control them from a single remote control. Benchmark uses that at shows and it works but it is too ungainly for regular home use.

Bogolu Haranath's picture

May be the other John, John Curl could come up with some thing similar to JC2 BP, with more channels and, more balanced inputs and outputs :-) .......

JRT's picture

Kal, I think you will find interesting the couple of pages of well detailed information in section 34.20 of the manual at the following link. Note that it is applicable beyond the hardware that is the subject of the manual.

https://www.archiv.rme-audio.de/download/adi2profs_e.pdf

Kal Rubinson's picture

Thank. I am aware of these issues although I had not read RME's document. In fact, I am currently using the digital volume control in my exaSound DAC.

Unfortunately, in addition to volume control, my needs also include providing/integrating additional multichannel and stereo sources, so the problem remains unsolved.

Bogolu Haranath's picture

May be the Doshi amp is an Objet d'art but the new Parasound JC1+ is an Objet de desir :-) ........

Bogolu Haranath's picture

May be the other John, John Atkinson could review the JC1+ and JC2 BP :-) ........

Kal Rubinson's picture

Sure but not likely. How many do you think he can sell?

Herb Reichert's picture

as his Blowtorch preamp
(which I am hoping to review)
just sayin'
h

Kal Rubinson's picture

Sadly, true.

Ortofan's picture

... JC's cache of unobtanium transistors?

Bogolu Haranath's picture

When HR reviews the Blowtorch pre-amp, he could compare it with Benchmark LA4 (or HPA4) and Parasound JC2 BP :-) .........

Bogolu Haranath's picture

It would also be interesting to see a comparison review of Benchmark HPA4 with Pass Labs HPA-1 :-) .......

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