XMOS-based Asynchronous USB to I2S interface - Page 47 - diyAudio
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Old 19th March 2012, 07:14 PM   #461
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Lorien,
in a direct comparation with M2Tech and Open source your XMOS modules is the winner.

USB to I2S: M2Tech vs XMOS vs Open-source Qnktc
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Old 19th March 2012, 07:16 PM   #462
weskoki is offline weskoki  Europe
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Great but what difference do you hear?
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Old 19th March 2012, 07:23 PM   #463
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There many differences in the sound and these will be explain in the next weeks in the other thread.
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Old 19th March 2012, 07:24 PM   #464
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XMOS module need short USB cable, I suggest 1.5m
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Old 19th March 2012, 07:50 PM   #465
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Do

I used these
Digi-Key - H5022-ND (Manufacturer - U.FL-2LP-088K1T-A-(100))
to connect Lucian's card to my Buffalo II

Best

Bob
looks good!

Thanks
Do
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Old 20th March 2012, 12:54 AM   #466
wlowes is offline wlowes  Canada
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Default USB Cable

Quote:
Originally Posted by audiodesign View Post
XMOS module need short USB cable, I suggest 1.5m
I actually use minimum length possible. In my case about 6 inches.

Prior to WaveIO I experimented with cables. I found shorter is better. Better cable is better. Best was home made. I simply took the ends off a good quality USB2 cable with gold plated ends and replaced their cable with two runs of CAT5 twisted pair.. the type that uses Teflon dielectric. This was far superior. I found the WaveIO to be far less cable sensitive than the pcm2706 converter it replaces. I still does well on this DIY cable. Ultimate setup would be WaveIO tight to MB and DAC board.
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Old 20th March 2012, 06:31 AM   #467
rsdio is offline rsdio  United States
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Originally Posted by wlowes View Post
I simply took the ends off a good quality USB2 cable with gold plated ends and replaced their cable with two runs of CAT5 twisted pair.. the type that uses Teflon dielectric. This was far superior.
Did you happen to print or otherwise save the diagnostic equipment screen shots showing the superior results? I suppose you performed all of the necessary USB compliance tests on your home made cables with the appropriate equipment...
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Old 20th March 2012, 08:08 AM   #468
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Originally Posted by rsdio View Post
Did you happen to print or otherwise save the diagnostic equipment screen shots showing the superior results? I suppose you performed all of the necessary USB compliance tests on your home made cables with the appropriate equipment...
come on.
Standard USB is often not even twisted, so transporting the four lines each as twisted pair having the common earth [probably?] at the sending equipment [Mac or AirPort] using CAT6 cable (even tighter wound and higher bandwidth than Cat5), using the foil shielded version even, should perform better - disregarding compliance tests that can only be done in the proper labs . . .
At least this was my plan - and solder the receiving end of the cable directly to the WaveIO board is how I fancy it.
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Old 20th March 2012, 12:40 PM   #469
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Originally Posted by rsdio View Post
Did you happen to print or otherwise save the diagnostic equipment screen shots showing the superior results? I suppose you performed all of the necessary USB compliance tests on your home made cables with the appropriate equipment...
wlowes did not suggest he'd taken measurements but his subjective report is credible on technical grounds.

The nominal impedance of a USB cable is IIRC 90 ohms and of a LAN pair 100 ohms, tolerances both about 15 per cent. IOW, they are close and overlap towards the limits with short lengths apparently making impedances less critical in any case. (BTW, if USB data pairs are not twisted, they are out of spec.)

Supplying the "B" connector's Vcc externally (i.e. no link to the host's Vcc) definitely makes for better sound as can, where practicable, omitting screening (lowers capacitance) and connecting host and DAC grounds direct, not via the USB.

These are strictly DIY tricks and not commercially practicable but they work well and cost nothing. I'm grateful to wlowes for the idea, first aired on AA.
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Old 20th March 2012, 01:01 PM   #470
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Wlowes, did you also add the crimp-on ferrites to your home made usb cable?
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