Pro-Ject Pre Box S2 Digital D/A headphone amplifier Specifications

Sidebar 1: Specifications

Description: DAC–headphone amplifier. Digital inputs: USB, coaxial (RCA), optical (TosLink). D/A-converter: two 32-bit ESS9038Q2M. Resolutions supported: USB: MQA, PCM up to 32-bit/768kHz, and DSD up to DSD512; optical and coaxial S/PDIF: PCM up to 24/192. Reconstruction filters: 8, selectable on front panel. Frequency range: 20Hz–20kHz. Analog outputs: ¼" (6.3mm) headphone, one pair RCA. Output voltage: 2.05V. Minimum recommended headphone impedance: 8 ohms. Headphone output power: 6.6mW into 600 ohms, 68mW into 32 ohms. THD: 0.0003% at 0dB, 2V RMS, 1kHz. Dynamic range: 124dBA. Outboard power supply (included): 5V/1A DC.
Dimensions: 4.1" (103mm) W by 1.4" (36mm) H by 4.1" (103mm) D, or 4.8" (122mm) D including knob & connectors. Weight: 0.8 lb (366gm) without power supply, 1.3 lb (600gm) with power supply.
Serial number of unit reviewed: 17A059178.
Price: $399. Approximate number of dealers: 300. Warranty: 2 year, parts & labor.
Manufacturer: Pro-Ject Audio Systems, Audio Tuning Vertriebs GmbH, Wirtschaftspark A5, Analogweg 1, 2130 Mistelbach, Austria. Tel: (43) 1-544-858-0400. Web: www.project-audio.com. US: Sumiko Audio, 6655 Wedgwood Road N. Suite 115, Maple Grove, MN 55311-2814. Tel: (510) 843-4500. Web: www.pro-jectusa.com, www.sumikoaudio.net.

COMPANY INFO
Pro-Ject Audio Systems, Audio Tuning Vertriebs GmbH
US: Sumiko Audio
6655 Wedgwood Road N. Suite 115
Maple Grove, MN 55311-2814
(510) 843-4500
ARTICLE CONTENTS

COMMENTS
Lorenzo-Italia's picture

Ladies and Gents
With 399$ You get “almost state of the art...”
If you really need more than “almost”, maybe “full” state of the art just multiply almost by a factor of 100!

Is this the way you manage your everyday life ? Think before you buy
Best
Lorenzo from Italy

Bogolu Haranath's picture

Another DAC/headphone amp to consider is Chord Mojo ($570) ......... Stereophile Class-A listed ........ Mojo is self powered with built-in battery :-) ........

er1c's picture

I have jumped back and forth between them as well. I too did not hear much difference scanning through the filters at first but now, 6 months in, with great NOS tubes in my Rogue Sphinx 2, I can clearly hear differences between a few. My preference, a significant preference, is the Linear Apodizing filter. With this filter mids on my LS50s are richer and have more weight. Close second (in a mood, a preference) is Hybrid, which on this gear gives some edge to the transients and I hear more energy in high frequency sounds. I did buy it for MQA on Tidal, for which I can offer no strong opinion at this time, just share that it is case by case, sometimes exciting but other times my experience is that I feel something in the music like the way you might get a feeling from food that's too processed, a sense that something is added that's subtly uncomfortable. S2 also doubles as DAC for my Cambridge CD transport, a very enjoyable detailed sound from my CD collection, though I plan this year to move up the food chain with a more sophisticated DAC. Film at eleven. Nice review thanks.

ken mac's picture

for your comments.

rt66indierock's picture

This review is an example of why you measure first and listen second. I measured it, Audio Science Review and John Atkinson measured it. We all came to the same conclusion that it measures well. Amir and I both found second harmonics which would have been worth discussing.

But if Tom Petty sounded louder in the MQA version you didn’t volume match. This renders many of your sound comments invalid. Finally, MQA like any format seems to be normally distributed with the majority either no difference or a different sort of different (thanks Kal).

ken mac's picture

you measure and listen independently. There are many many instances where gear measures poorly and sounds great and vice versa. A story as old as the hills. MQA sounded louder and I adjusted volume. And MQA sounded better on every available track. Your comments are invalid. Cheers.

rt66indierock's picture

I appreciate you documenting your lack of understanding of volume matching. Fortunately, someone I’m frequently at odds with can help, your new editor Jim Austin.

Ken you measure first to simply verify the component is quiet enough to take full advantage of the 96 dB on a 16/44.1 file. If it doesn’t, I box it up and return it as unacceptable.

As for every MQA track sounding better, those of us who tuned live systems with The Nightfly find the MQA version to be worse.

As for your comments about measurements and sound I think you are misinterpreting what Daniel von Recklinghausen meant so I’m going to write an article about it.

ken mac's picture

Which began with J. Gordon Holt, continued through the first JA and is now upheld by the current JA is to listen first, then measure. Sorry if our methods don't agree with your's. Plenty of mags/sites/forums where your views are in vogue...hey, you can even submit your article...Nightfly as barometer? No wonder.

Graham Luke's picture

...model worthy of consideration is the excellent Gilmore Lite Mark 2 by Headamp. The Gilmore does not have a built in DAC but pairs incredibly well with a Dragonfly Red. The beauty is that you can mix and match DACs and upgrade in the future.

RaimondAudio's picture

There are many other very good cheap DAC's like: Topping DX7s, Topping DX3PRO, Topping D50, Aune X1s, Khadas Tone,SMSL SU-8V2 etc. Over 1.000$ we have Okto DAC, RME ADI-2, Gustard X26, Yulong DA10, SMSL D1, etc.

dc_bruce's picture

"Class A," they said.

If these classifications have any meaning, then this little box is just as good as, say, the Chord Quetest or the Schitt Yggdrasil. Admittedly, the test scores are nice; but the aural comparisons in the review are with other similarly priced budget DACs, like the Dragonfly. And, it was not even a clear winner, subjectively, over the Dragonfly.

For that matter, after Mr. Atkinson's glowing, enthusiastic review of the Quetest, I was surprised it was not in the "A+" category. Would that be because the much more expensive Chord DAVE is in that same group?

Having never had the opportunity to compare a slew of DACs against each other, I can't say whether meaningful (i.e. audible) differences between DACs exist. But it seems to me that if Stereophile is going to be in the business of ranking them-- Class A+, Class A, Class B, etc. -- then some kind of explanation is in order . . . and more than the vague generalities that precede the rankings.

Or, maybe I should just risk a few hundred $$$ and find out for myself.
So, is it just going to be about the numbers from now on?

helomech's picture

based on JA's measurements. I had been wanting to try a more modern architecture but figured I'd wet my feet before shelling out 3X as much for a Benchmark or Mytek. After spending a few days with the Pre Box S2, it's hard to imagine much can be gained with those pricier units. While it may not be a giant slayer, it's quite an upgrade over my old Topping PCM DAC. The Pre Box also outperforms my Line Magnetic 502 CA when compared to the latter's SS mode. That DAC had an MSRP of $1800 just a few years ago.

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