First impressions of new MH-DA006, Musetec flagship

@melm First off, as I mentioned previously reverse engineering required to determine quality of these clocks and power supplies, manufacturers rightly don't advertise their schematics and all part numbers.

As for usb vs I2S I've never stated all I2S implementations will beat all usb implementations, my previous experience with SU 6 and 005 being inferior to ubs proves this out. Golden Sound replicates ASR in that measurements tell all. I presume all 005 owners understand the fallacy of this what with it's poor performance over at ASR. More proof of this folly is my experience with Okto Stereo dac which at one point was SNR champ at ASR, jitter right up there as well. So, Okto vs 005 which measures poorly. Sold the Okto, kept the 005, amazing how a dac with lousy SNR was more highly resolving than top rated Okto. My point is one should pick the Singxer SU6 over the Gaia if measurements are your final arbiter for equipment purchases. I've had both in house, Gaia wins on build quality, design and sound quality. As for the Audio GD, I can only speculate as to it's performance, I chose the Gaia, happy with the purchase, especially with the Tubulus cable.

 @catastrofe I understand the theoretically inferiority of external clocks via I2S interface. Well usb is also a very flawed interface, never designed for the purpose it's used for in dacs. Think about all the complexity of usb boards within dacs, lots of technology required to clean up this flawed interface. Back to I2S, well Gaia external clock beats out 006 internal clock, and not by just a bit, so much for theoreticals. Still, I'd advise sticking to 1/2 M or less for I2S cables.

Bottom line, I agree we should be concerned with design, parts, build quality, and measurements. After decades spent in audio, I treat measurements as perhaps the least important aspect for end users. Measurements are of critical importance for designers/engineers, not so much for us. Musetec, in their own statements admits their final designs based on listening vs measurements. I presume many other manufacturers do exactly the same.

@sns 

If USB is so flawed, why hasn't the market driven it to the trash bin? Every DAC manufacturer has the ability to provide an I2S and/or external clock input, yet most don't even though it would provide an enhanced revenue stream in the form of DDC and clock sales.

The top DAC manufacturers (DCS, Weiss, MSB, Wadax, etc.) eschew the use of I2S for USB. Sonore doesn't provide an I2S output on their Rendu devices because they found that implementation matters more than the "format". Jusi Laako, founder of Signalyst/HQ Player is fairly vocal regarding the negatives of I2S due to the clock being so far removed from the DAC.

PS Audio was one of the first manufacturers to promote I2S in their original PerfectWave DAC for which I was a Beta Tester. At that time (~2007) I was all-in on I2S and it definitely sounded better than USB. As technology has progressed, improvements in USB isolation and better clock implementations have reduced any perceived benefit provided by I2S.

If you feel that your system sounds better via I2S compared to USB, great, but that doesn't mean it's empirically better and it's certainly not an absolute.

@sns 

First of all we agree that what matters most is the sound, and not measurements.

Obviously, what triggered my last post was your "unfortunately only Femto clock" remark.  But when you are talking specifically about clocks, you are focusing on jitter (and phase noise) and that is measureable.  And it would appear that the Gaia's OCXO has no partiular advantage over the ubiquitous Accusilicons and Crysteks that you seem to disparage.  And there are yet better Femto clocks available!   In identical set-ups simply substituting better clocks has clearly been shown to improve the sound in ways considered imprtant to audiophiles like space, air, focus, soundstage, etc.

As for I2S vs. USB outputs, I was only considering your remarks about those of the Gaia.

And last of all we agree that what matters most is the sound, and not measurements.

@melm 

Well stated, and spot-on.

@catastrofe

The answer is that for most people USB is good enough.  It also easily allows people to use their laptops directly into a DAC and a conveniently long cord.  Their streamer and file storage are already at hand.  We used to put a filter on the line and call it a day.  And if you can make USB work as well or better than the alternatives, that's great.

For the great majority that do not use USB out to their DAC, they use a device with spdif, which is very closely related to I2S.  The great majority of all the RPi hat devices output spdif.  Some reviewers, Hans Beekhuyzen for one, says that for him I2S and spdif or AES/EBU (that is similar to spdif) are virtually indistinguishable coming from the same streamer.  And the spdif cable can be conveniently long.  The highest performing streamer he and a lot of other people have ever used is the Grimm Audio MU1.  It has no I2S output, but only spdif and AES/EBU.

I don't see any reason to have USB in the mix if it avoidable.  Going from ethernet to I2S is such a clear path.  And so too it would seem, based on what hardware is available, going from ethernet to spdif-AES/EBU as the next best thing.  No need for what we used to call USB decrapification.