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15th March 2012, 07:14 AM
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#1 |
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diyAudio Member
Join Date: Sep 2005
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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. Last edited by audiodesign; 15th March 2012 at 03:51 PM. |
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15th March 2012, 09:11 AM
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#2 |
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diyAudio Member
Join Date: Sep 2005
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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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15th March 2012, 09:32 AM
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#3 | |
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diyAudio Member
Join Date: Sep 2007
Location: Multiple...
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Quote:
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 09:43 AM. |
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15th March 2012, 09:56 AM
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#4 |
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diyAudio Member
Join Date: Sep 2005
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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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15th March 2012, 10:20 AM
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#5 | |
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diyAudio Member
Join Date: Sep 2007
Location: Multiple...
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15th March 2012, 10:28 AM
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#6 |
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diyAudio Member
Join Date: Sep 2005
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Do you have 4 interfaces ?
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15th March 2012, 10:38 AM
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#7 | |
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diyAudio Member
Join Date: Sep 2007
Location: Multiple...
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Quote:
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 10:46 AM. |
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15th March 2012, 10:39 AM
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#8 |
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diyAudio Member
Join Date: Sep 2005
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Which is the best for you ?
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15th March 2012, 11:18 AM
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#9 | |
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diyAudio Member
Join Date: Sep 2007
Location: Multiple...
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15th March 2012, 03:57 PM
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#10 |
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diyAudio Member
Join Date: Sep 2005
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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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