CM6631 usb audio interface .... any good ? - Page 11 - diyAudio
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Old 15th January 2013, 09:43 AM   #101
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Nice eval board, playback and recording, but how to get firmware for this...
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Old 16th January 2013, 12:57 AM   #102
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Diyinhk now has an isolated board, which looks a bit better than my hacked one ! However, it still doesn't have termination resistors between the cm6631 and the isolator. ???

Isolated 24bit 192kHz USB to I2S/SPDIF CM6631A PCB for ES9018 AK4399 PCM1794 | eBay

Click the image to open in full size.

Last edited by KlipschKid; 16th January 2013 at 01:04 AM.
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Old 16th January 2013, 07:46 AM   #103
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Termination resistor is not necessary from one source to one load and short tracks, overshots are very small, for long track is recomended equalize time response and eliminate overshots, signal integrity simulation is very useful, I think Diyinhk should do for this pcb.
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Old 19th January 2013, 12:27 PM   #104
regal is offline regal  United States
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Is there a 176.4 khz i2S output firmware for this chip yet ?
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Old 20th January 2013, 12:37 AM   #105
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Hi,

I remember reading somewhere that 176 works with the Asus firmware and their own driver, but it doesn't work with factory firmware and driver. There are sellers who will flash the firmware with either version before they ship the device.

Julcat has his working for this:
CM6631 usb audio interface .... any good ?

DIYINHK - what isolator IC did you choose ? Analog Devices ? Silabs ? IL ? Ti ?

cheers

Last edited by KlipschKid; 20th January 2013 at 12:46 AM.
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Old 20th January 2013, 05:44 AM   #106
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Hey Regal,

I've just finished stage1 of a build using these two together - they do 176@24. however, it seems the cheaper CM6631 from this seller don't support that. I don't know exactly why - I know the driver is different, maybe the firmware is too.

24bit 192kHz USB to I2S PCB CM6631/A w/Ultralow noise 6.5uV regulator for ES9018 | eBay

and

ES9018 32bit Audio DAC PCB kit | eBay
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Old 23rd January 2013, 02:53 AM   #107
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Exclamation CM6631A problem.

DIYINHK - the CM6631A spdif volume has 6dB gain over CM6631 so it is distorted. The only to fix this is -6dB volume in the PC.

Can you find out if this is a firmware or driver problem please ? What can I do to fix this ? Thank you !
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Old 23rd January 2013, 04:41 AM   #108
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Default No problem !

Quote:
Originally Posted by KlipschKid View Post
DIYINHK - the CM6631A spdif volume has 6dB gain over CM6631 so it is distorted. The only to fix this is -6dB volume in the PC.

Can you find out if this is a firmware or driver problem please ? What can I do to fix this ? Thank you !
Hi,

My mistake - stupid me. It was a register setting on the wm8805 receiver.

cheers
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Old 25th January 2013, 03:29 PM   #109
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Hy, i've bought the board and i'm using it with windows7 foobar wasapi sox resampler and a north star 192, the board work good until 96 khz but if i set sox to 192 the dac light the correct led but there is no sound, could you help me????
Could the board work with Linus??? If yes, wich version???do i need particular driver???
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Old 25th January 2013, 03:58 PM   #110
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Which board ? There are different ones.

I'm not aware of a Linux driver, but maybe someone else does ? Have you checked Asus' site about the Essence One ?

For the 192 issue, I'd check Windows' device settings and the ASIO bit depth driver first.

Have you tried your DAC with any other 192Khz sources ? Are you using spdif or I2S ?

Last edited by KlipschKid; 25th January 2013 at 04:02 PM.
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