USB to I2S: M2Tech vs XMOS vs Open-source Qnktc - diyAudio
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Old 15th March 2012, 08:14 AM   #1
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Default USB to I2S: M2Tech vs XMOS vs Open-source Qnktc

I am testing these 3 USB-I2S interfaces:

- M2Tech module by AckoDAC (https://sites.google.com/site/ackodac/home)

- XMOS by Lucian (XMOS-based Asynchronous USB to I2S interface)

- Open Source by Qnktc (Q N K T C)

All are asynchronous USB Audio device using two quartz precision oscillators to clock source for output data stream with a very low jitter.

I have tested these interfaces connected at the same DAC chip and there are many differences in the listen test.
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File Type: jpg HiTech_Xmos.JPG (216.3 KB, 1778 views)

Last edited by audiodesign; 15th March 2012 at 04:51 PM.
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Old 15th March 2012, 10:11 AM   #2
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Here an example of the test environment

http://www.audiodesignguide.com/HiRe.../WM8740sch.jpg

Now I have left the WM8740 because I have found a bad sound with some new production chips.

The my choice now is the AD1955 with active I/V and Lundahl transformers.

I am testing some configurations to use the AD1955 with passive I/V.
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Old 15th March 2012, 10:32 AM   #3
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Originally Posted by audiodesign View Post
Here an example of the test environment

http://www.audiodesignguide.com/HiRe.../WM8740sch.jpg

Now I have left the WM8740 because I have found a bad sound with some new production chips.

The my choice now is the AD1955 with active I/V and Lundahl transformers.

I am testing some configurations to use the AD1955 with passive I/V.
When will you start the testing ?
I have M2Tech USB -> I2S, QNKTC / Audio Widget USB -> I2S, exaU2I USB -> I2S and other USB -> I2S devices...
And have done my own testing so your results would be interesting

Last edited by RayCtech; 15th March 2012 at 10:43 AM.
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Old 15th March 2012, 10:56 AM   #4
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I hope this weekend.

Two my friends with a lot of experience on music reproduction and live recordings will be present at the test.

Obviously I will indicate only the best to have no problems.
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Old 15th March 2012, 11:20 AM   #5
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I hope this weekend.

Two my friends with a lot of experience on music reproduction and live recordings will be present at the test.

Obviously I will indicate only the best to have no problems.
I forgot to mention the USB -> I2S device I am currently using so the units I am using that are worth mentioning are: Light Harmonic Titan USB -> I2S, M2Tech USB -> I2S, QNKTC / Audio Widget USB -> I2S and exaU2I USB -> I2S...
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Old 15th March 2012, 11:28 AM   #6
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Do you have 4 interfaces ?
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Old 15th March 2012, 11:38 AM   #7
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Do you have 4 interfaces ?
Actually more than that, but I normally uses them one at a time...
I have IR remote controlled input switching so I can switch between I2S inputs and also SPDIF inputs...
When comparing units I have two identical PC / Mac systems with the same music and starts a playlist on both...
Then I can switch between I2S inputs and compare units

Last edited by RayCtech; 15th March 2012 at 11:46 AM.
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Old 15th March 2012, 11:39 AM   #8
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Which is the best for you ?
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Old 15th March 2012, 12:18 PM   #9
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Which is the best for you ?
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...
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Old 15th March 2012, 04:57 PM   #10
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The AD1955 DAC have current sink outputs instead of current source outputs so I am testing some configurations suggested in this document.

http://www.ti.com/general/docs/lit/g...9&fileType=pdf
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