USB to I2S: M2Tech vs XMOS vs Open-source Qnktc - Page 2 - diyAudio
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Old 15th March 2012, 04:59 PM   #11
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Originally Posted by RayCtech View Post
When your test results are posted - then I can comment my private opinions as I expect my results will be different from yours, and I do not have any XMOS based devices so I do not have the same reference platform as you...
A technicality, but I though the Titan was a xmos chip, though certainly a different xmos chip to the WaveIO board!

I'm quite interested to see outcome in this thread.
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Old 15th March 2012, 09:12 PM   #12
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I'll volunteer a guess for the winner: Exa, but heavily modded
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Old 15th March 2012, 09:20 PM   #13
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I'll volunteer a guess for the winner: Exa, but heavily modded
I know that there is one exaU2I with my JFET regulators in Sofia
With a acko ES9012 DAC etc. etc..
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Old 16th March 2012, 12:25 AM   #14
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Default Great idea!

I am most interested in hearing your results. My bets are on WaveIO. I use it with external power supply but with the uBMC connectors.

Have you tried comparing the uBMC vs the isolated I2S output? I have read that isolation chip adds some jitter.

Also, can you share how your PC is set up and what player?
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Old 16th March 2012, 08:14 AM   #15
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I need to specify that the Twistedpearaudio.DAC with Sabre ESS ES9018 cannot be considered a good DAC module for this test because it does not use the master clock of the I2S bus generated by the USB-I2S interface.
The Twistedpearaudio.DAC reclock and resample with another oscillator so the sonic performances with Twistedpearaudio DAC could be completely different, worse or better, but in any case the accuracy of the modules USB-I2S is not used.
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Old 16th March 2012, 08:29 AM   #16
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I am a Windows user so I normally use Foobar2000 with Convolver module for the DRC but these tests will be performed on a my friend house with MAC OS X, Fidelia by Audiophile Engineering player (Audiofile Engineering - Fidelia) and LA COnvolver for the DRC.
The loudspeakers used will be ESL 57 or vintage Spendor driven by my 813/GM70 SE amplifier.

DRC
Digital Room Correction

813/GM70 SE Amp.
813 / GM70 amplifier with Bartolucci transformers
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Old 16th March 2012, 09:52 AM   #17
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As I use a bitperfect approach I can listen to the differences of the USB -> I2S units..

The use of Fidelia and DRC are a completely different kind of game and your "test" results would be incompatible with mine.

But maybe your friend could play using the BitPerfect app (iTunes) and check the fidelity in a close to bitperfect setting.
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Old 17th March 2012, 12:19 AM   #18
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Even though we all have different use cases, this promises to be a very interesting comparison. It would be great if you could to do one round of listening with as little processing of the source signal as possible.
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Old 19th March 2012, 04:12 PM   #19
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In the first test XMOS is the best and the differences are very big.

813/GM70 SE Amp. + Quad ESL63
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Old 19th March 2012, 07:59 PM   #20
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Originally Posted by audiodesign View Post
In the first test XMOS is the best and the differences are very big.

813/GM70 SE Amp. + Quad ESL63
I had already ordered a WaveIO for evaluation so this was good news
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