CM6631 usb audio interface .... any good ? - Page 15 - diyAudio
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Old 3rd February 2013, 11:34 AM   #141
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Hi,

ASIO: channel map is just left and right (you can switch these with no problems).

You might need to shut down and re-boot, but I expect you've already tried this ? IIRC I got mine working by changing the windows settings and using wasapi and then asio, but I honestly can't remember, and I've since been using the 31A so I have a different driver now.

I can try again tomorrow if you're still stuck and see if I can remember what I did. Getting old. ;-)
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Old 3rd February 2013, 12:31 PM   #142
wklie is offline wklie  Hong Kong
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Quote:
Originally Posted by KlipschKid View Post
Hi,
ASIO: channel map is just left and right (you can switch these with no problems).

You might need to shut down and re-boot, but I expect you've already tried this ? IIRC I got mine working by changing the windows settings and using wasapi and then asio, but I honestly can't remember, and I've since been using the 31A so I have a different driver now.
I opened up my converter and see that the chip is really CM6631A. (I also checked that it has the optional TCXO oscillators that I paid extra for.)

Yes, I rebooted multiple times, and even uninstalled and reinstalled the July 2012 drivers U6631_U6631A-1.01_20120730.rar . My foobar is at the latest version, with the latest ASIO plugin and the WASAPI plugin. I also switched back and forth among DirectSound, ASIO, WASAPI (push) [OK], WASAPI (event) [Not working].

In my channel map for ASIO for C-Media USB Device, it has:
SPKOut00_00 ch | 24-bit | Left
SPKOut00_01 ch | 24-bit | Right
HPOut00_00 ch | 24-bit | <none>
HPOut00_01 ch | 24-bit | <none>

Playing test signal with each of these four items yields nothing.

Whereas the channel map for ASIO4ALL v2 has:
Headphone 1 | 32-bit | <none>
Headphone 2 | 32-bit | <none>
SpdifOut 1 | 32-bit | Left
SpdifOut 2 | 32-bit | Right
Speaker 1 | 32-bit | <none>
Speaker 2 | 32-bit | <none>

Comparing these two channel maps, it is obvious that the C-Media ASIO driver in my case lacks the SPDIF which I need.

I also solved the mystery of 88.2kHz. It turns out that my Denon 3802 supports 96kHz but not 88.2kHz - which is not documented in the manual and not found from google. This sounds really stupid of me.
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Old 3rd February 2013, 02:18 PM   #143
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Hi,

Your 31A driver is very different to mine - from memory I only have
SPKOut00_00 ch | Left
SPKOut00_01 ch | Right

but I'll check again tomorrow.

However, it didn't matter for me - spdif is directly from the pin of the chip, and with the 31A was not driver related - always on. So, perhaps, if you have no spdif, then trace it back to the chip and check the physical circuit ?
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Old 3rd February 2013, 03:19 PM   #144
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Hi,

Just had a quick check - my channels are indeed spdif, not spk. So maybe you can try the driver here, and see if that fixes it :

Isolated 24bit 192kHz USB to I2S/SPDIF CM6631A PCB for ES9018 AK4399 PCM1794 | eBay
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Old 3rd February 2013, 05:01 PM   #145
wklie is offline wklie  Hong Kong
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Quote:
Originally Posted by KlipschKid View Post
Just had a quick check - my channels are indeed spdif, not spk. So maybe you can try the driver here, and see if that fixes it :
Hi, thanks for the driver. It's exactly the same driver I'm using. If we are both using the same driver, the same CM6631A chip, assuming I've not done anything stupid with foobar ASIO, the only differences that remain would be the firmware and the circuit...
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Old 4th February 2013, 01:17 AM   #146
wklie is offline wklie  Hong Kong
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Quote:
Originally Posted by KlipschKid View Post
spdif is directly from the pin of the chip, and with the 31A was not driver related - always on. So, perhaps, if you have no spdif, then trace it back to the chip and check the physical circuit ?
Although the native ASIO driver for foobar output to SPDIF does not work in my case, SPDIF output does work using DirectSound, WASAPI (push) or ASIO4ALL.
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Old 4th February 2013, 04:42 AM   #147
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It may sound obvious, but have you tried changing the channel map in the ASIO driver ? You should be able to click on it and select .... ? I'm sure you must have trie this already.... if that doesn't work then it could be a BIOS/USB issue, or, as you say, a firmware issue. Can the seller help ?
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Old 4th February 2013, 03:59 PM   #148
tdtsai is offline tdtsai  Taiwan
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Hi Wklie:
Native ASIO driver from C-Media do not support SPDIF out. For some reason native ASIO driver only output sound from Speaker and Headphone. I guess your CM6631A firmware is use standard firmware the VID/PID is 0x0D8C/0x0314. If you use other firmware like VID/PID 0x0D8C/0x0309 or VID/PID 0x0D8C/0x0310 you will only see SPDIF out device. And the ASIO driver support SPDIF out.

Quote:
Originally Posted by wklie View Post
I've just bought the USB to SPDIF converter in post #34 on page 4 from Weiliang's shop (not via ebay). I was told it'd use CM6631A instead of CM6631 (I've not opened up the converter to check it visually, yet). The hardware works, but I've run into some driver/firmware issues:

1. Using C-Media July 2012 drivers, foobar ASIO output via native ASIO drivers results in no sound in SPDIF. Switching to ASIO4ALL driver works though. The foobar ASIO channel map shows Headphone and Speaker but no SPDIF in the native ASIO driver (which I suspect is the reason for my problem), whereas the ASIO4ALL does have the SPDIF output in the channel map. Could somebody who has working foobar native ASIO output to SPDIF tell me what their channel map looks like?

2. 88.2kHz has no sound. I found this strange since I supposedly have the CM6631A which adds 88.2kHz and 176.4kHz to CM6631. I suspect this may be related to the firmware. Does anyone know how to check firmware version? I can only find the 2203 firmware for download. From a Chinese forum I see there is firmware 2205 and 2206 as well, but I can't find them after a lot of google.

3. I tried to install the C-Media April 2012 drivers, but it refuses to install since it cannot get past the detection of the C-Media converter. Is this because CM6631A is only supported starting from the July drivers?

Thanks in advance. Sorry for the long post.
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Old 4th February 2013, 05:12 PM   #149
wklie is offline wklie  Hong Kong
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Quote:
Originally Posted by tdtsai View Post
Native ASIO driver from C-Media do not support SPDIF out. For some reason native ASIO driver only output sound from Speaker and Headphone. I guess your CM6631A firmware is use standard firmware the VID/PID is 0x0D8C/0x0314. If you use other firmware like VID/PID 0x0D8C/0x0309 or VID/PID 0x0D8C/0x0310 you will only see SPDIF out device. And the ASIO driver support SPDIF out.
Thanks tdtsai! You are correct! Mine is really using 0x0D8C/0x0314. May I ask from where can these PID - ASIO relationship information be obtained?

Thanks to KlipschKid for your help too!

I discussed with the seller before reading this message. He sent me a newer driver package (other than including a Windows 8 directory, the other file dates are the same as July 2012 drivers), which does not fix this issue. I raised the possibility that maybe a different firmware is required for the driver to show SPDIF instead of Speaker/Headphone, but he does not think this is the case. Instead he believes there is some problem with my PC settings.

Now I can put this issue to rest. I just need to learn the truth, and hoped to try out the native ASIO driver, in the unlikely event that I can hear an improvement over ASIO4ALL, which works well. I don't really have to use the native ASIO driver. Someone from a Chinese forum tested its compatibility with eight different player software, and found that is incompatible with everything except foobar.
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Old 4th February 2013, 07:43 PM   #150
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Thanks. This was my thinking too.

Other question:
  • is this a synchronous or a-synchrous application? (looks like a pun, zen guys would love it).
  • I have understood asynch to offer best click-less working in other threads; now I understand it is claimed that with the Sabre interface the normal old fashioned synch gives a better result, without un-lock clicks.
  • would that go for other I2S DAC too (like my silly old fashioned TDA1541?

    albert :-)
Quote:
Originally Posted by themartianboy View Post
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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