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Old 16th June 2013, 06:27 AM   #361
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Join Date: Jun 2013
Quote:
Originally Posted by f2a View Post
Hello everyone , i have the same board like the one at Post #12 .With the original FW the RCA and I2s output works but in I2s i hear only the left side in all resulutions. I tried the circuit from post #6 Left-justified I2S to Philips I2S Converter , i hear now on the left and right side with much noise ... My DAC use in original a PCM2706 with Philips I2s output . The DAC accept max 24Bit/174MHz . In 16Bit/44.1Mhz to 32Bit/192kHz is no change . Has anybody a idea ? I'm a little Rookey in electronics, but i can built everything ;-) Can anybody say me why the I2s output from the CM6631 is different like the one from the PCM2706 then i use the same resulution (16/44.1) ? Is I2s not the same? Thank you for a Little help and sorry for My BAD english :-) Have a nice day :-)
I can confirm the same issue but with a diffrent board. My board is from breeze audio (CM6631A). The board is connected via I2S with a TAS3308 DSP. In sample rates 44.1/48 i can hear actually the audio, but there is a lot of noise (distortion). Interestingly, when i upsample the audio via reclock to 88.2 oder 96 Khz, the noise is completly gone. So the I2S connection seems to be fine... I assume that the CM6631A puts out the wrong Bitclock (SCLK) in 44.1/48 Khz mode. This was discovered by HifiDuno in his Blog (cm6631 | Search Results | H i F i D U I N O ). He states, that the Bitclock for 44.1/48 is 128 fs, but it should be 64 fs for those sample rates.

Any ideas how to fix this? Maybe a new firmware can fix this? The connection via i2s works with higher sample rates, so i dont think the error has to be the i2s connection to the dsp.

Thanks!

BTW, the cm6631 and all clocks are running on battery, just feeding the 3.3 Voltregulators with 4 1,2 V NimH batteries and it much better compared to SMPS.

Last edited by Archimedes21; 16th June 2013 at 06:45 AM.
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Old 16th June 2013, 11:41 AM   #362
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Join Date: Apr 2011
Hi
Right now i'm using CM6631 with Asus firmware which solved couple problems. There are thoese.
1. WASAPI and ASIO didn't worked on SPDIF output. Kernel streaming was unavailable.
2. Converter didn't send any signal when music was not playing, so DAC lost synch. My DACs dont have mute control so i could hear something like white noise.
3. SPDIF output was recognised in windows like an extra SDPIF output. Not like "speakers" in all other converters and USB receivers.

My friends would also buy converter with CM6631/A, but without thoese problem which had CM6631 with firmware from Cmedia. Right now it's impossible to buy converter with older CM6631(out of stock) and as far as I now firmware from CM6631 didn't fits to CM6631A.
Are there any other solutions?

Thanks for any help.

Last edited by patrykvel; 16th June 2013 at 11:47 AM.
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Old 17th June 2013, 01:47 AM   #363
wklie is offline wklie  Hong Kong
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Join Date: Feb 2013
Quote:
Originally Posted by patrykvel View Post
Hi
1. WASAPI and ASIO didn't worked on SPDIF output. Kernel streaming was unavailable.
2. Converter didn't send any signal when music was not playing, so DAC lost synch. My DACs dont have mute control so i could hear something like white noise.
3. SPDIF output was recognised in windows like an extra SDPIF output. Not like "speakers" in all other converters and USB receivers.

My friends would also buy converter with CM6631/A, but without thoese problem which had CM6631 with firmware from Cmedia. Right now it's impossible to buy converter with older CM6631(out of stock) and as far as I now firmware from CM6631 didn't fits to CM6631A.
See the summary I posted in
CM6631 usb audio interface .... any good ?

and firmwares for both CM6631 and CM6631A in
CM6631 usb audio interface .... any good ?

Briefly, (1) I use CM6631A firmware 0108 PID 0314 Firmware, it will output to SPDIF via WASAPI (push) but not via ASIO. It also can passthrough DTS and AC3 correctly. (3) The SPDIF output shows up as SPDIF, not speakers.
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Old 21st June 2013, 10:14 AM   #364
alkasar is offline alkasar  France
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Location: near Paris, France
Hi all,
I bought the converter (weiliang v1.4) with CM6631A. The device not yet arrived and I noticed the firmware download link at nutsaudio is broken
Any other place where I could find this windows driver ?

I'll also try the asus essence one driver.
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Old 21st June 2013, 01:12 PM   #365
alkasar is offline alkasar  France
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Join Date: Jan 2009
Location: near Paris, France
the link at nuts audio is live again
http://www.nutsaudio.com/Driver/CM6631A_driver.zip

sorry for disturbing
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Old 22nd June 2013, 02:01 AM   #366
wklie is offline wklie  Hong Kong
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Join Date: Feb 2013
Quote:
Originally Posted by alkasar View Post
Hi all,
I bought the converter (weiliang v1.4) with CM6631A. The device not yet arrived and I noticed the firmware download link at nutsaudio is broken
Any other place where I could find this windows driver ?

I'll also try the asus essence one driver.
Use this:
http://emotiva.com/resources/media/x...2012_12_12.zip

Do not use the Asus Essence One driver for CM6631A.
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Old 22nd June 2013, 10:22 AM   #367
alkasar is offline alkasar  France
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Join Date: Jan 2009
Location: near Paris, France
Quote:
Originally Posted by wklie View Post
Use this:
http://emotiva.com/resources/media/x...2012_12_12.zip

Do not use the Asus Essence One driver for CM6631A.
Thnkas for heads up.
Looking at file dates & size and winrar CRC32, Emotiva drivers are the same as nutsaudio drivers.
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Old 23rd June 2013, 07:51 AM   #368
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Join Date: Dec 2005
Location: Montignies sur Sambre
Has anyone the flash update tool from here:

Quote:
To be used with the flash update tool found in the CM6631 Firmware 2203 package VID 0x0D8C PID 0x0309 on Windows XP _ONLY_:
http://www.nutsaudio.com/driver/CM6631_Firmware.zip
the link doesn't work anymore

thank you
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Old 27th June 2013, 04:48 AM   #369
wklie is offline wklie  Hong Kong
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Join Date: Feb 2013
Quote:
Originally Posted by vlad_2770 View Post
Has anyone the flash update tool from here:
the link doesn't work anymore
I believe (but not verified) that the Asus Xonar Essence One USB Firmware Update tool is the same thing:
Xonar Essence One - Sound Cards and Digital-to-Analog Converters - ASUS

However, use the tool only, not the Asus firmware.

If it works for you, please let us know.
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Old 2nd July 2013, 10:41 AM   #370
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Join Date: Oct 2012
does anyone know where i can find the i2c map register for the cm6631 ?
i need it to detect the input frequency.
thank you
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