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Old 29th January 2013, 09:12 AM   #121
tdtsai is offline tdtsai  Taiwan
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You should not use ASUS firmware. The ASUS firmware is for ASUS hardware only. PM me your what OS you use and your device's VID/PID I can find right for you.

Quote:
Originally Posted by KlipschKid View Post
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
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Old 29th January 2013, 09:14 AM   #122
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This is the answer from the seller:
This is a product for diyer to enjoy, there are unlimited possibility.
The item description includes the I2S detail
The DAC should support the following I2S signal specification to decode each sampling rate:
*We have tested PCM1794A and it can work at 192khz 256fs(MCLK 49.152Mhz) with this PCB perfectly. There are some DAC can only decode 192khz at maximum 192fs(MCLK 36.864Mhz), user can DIY a MCLK divider or other circuit to interface with those DAC chip to decode up to 192kHz or can only stay at their lower sampling rate(MCLK)
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Old 29th January 2013, 09:24 AM   #123
tdtsai is offline tdtsai  Taiwan
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I don't think the CM6631A SPDIF volume has 6dB gain. The CM6631A SPDIF out does not has volume on it. Do your board have use SPDIF IN to I2S out IC? Like DR9001 or CS8416. Maybe the 6dB gain is come from CS8416/DR9001 output fromat setting is not right for the code input.

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 !
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Old 29th January 2013, 12:37 PM   #124
UnixMan is offline UnixMan  Europe
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Quote:
Originally Posted by KlipschKid View Post
I'm not aware of a Linux driver, but maybe someone else does ?
Linux supports UAC2 async standard natively, via its ALSA drivers (included in the kernel).

Unfortunately, while it works perfectly with other UAC2 chipsets (e.g. Xmos, AudioWidget, Amanero, ecc), with this specific chip (CM6631) there seems to be some problems that needs to be fixed.

Perhaps DIYINHK may help by providing a sample card to the ALSA driver developers...
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Old 29th January 2013, 02:11 PM   #125
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Default What is difference CM6331 and CM6331A

I have only found some brochure from cmedia on CM6331A, nothing about the non-A.
  • What is the difference?
  • Do both support mac-os (yes I assume because that is always USB 2.0)
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Old 30th January 2013, 01:44 AM   #126
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Julcat mentioned near the beginning of this thread that he was using a CM6331 board successfully with his Mac.

I asked the seller of the isolated CM6331A board about working with Mac OS 10.4 and he said this:
We do not have mac machine to test, somebody told it work but it should depend on the os version and system configuration.
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Old 30th January 2013, 10:56 AM   #127
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I don't know the differences between 6631 and 6631a, but they are definitely different. I have both and the 31a won't work with 31 driver. The 31a is also fussy about it's start-up power conditions, which the 31 is not. Besides this, I'm sorry, but I don't know anything else.
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Old 30th January 2013, 11:52 AM   #128
pji is offline pji  United Kingdom
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[QUOTE=KlipschKid;3341705] I'm not aware of a Linux driver, but maybe someone else does ?


It is working fine for me with Ubuntu 12.04 and ALSA drivers. No extra software was required. Currently using it with a USB Isolator board (ADUM4160 based), output to a ES9023 home made DAC (Works equally well without the Isolator, but wished to use this and it was an easy way of introducing an external supply for the CM6631 board).

In this configuration, I do find that the DAC needs to be powered up before the PC in order for it to be detected.
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Old 30th January 2013, 01:43 PM   #129
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Cool ! Now someone should try with jelly bean...
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Old 31st January 2013, 12:57 AM   #130
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DIYINHK - new product suggestion - use the cm6631 board and add an ES9023 DAC IC in synch. Other ES9023 use the inferior tenor usb receiver.
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