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Old 1st November 2013, 01:41 PM   #421
diyAudio Member
 
Join Date: Sep 2009
Location: Romania,Calarasi
Hi, i changed the usb cable ,and the drivers,and the firmware with the ones that i found here on forum,both of them makes the same problem.Soon i will buy a XMOS+PM5102 DAC 32bit/384Khz in case i hope that one will work flawless.
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Old 5th November 2013, 09:41 AM   #422
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Join Date: Dec 2003
Location: GE
Quote:
Originally Posted by ionutzxpo View Post
Hi, i changed the usb cable ,and the drivers,and the firmware with the ones that i found here on forum,both of them makes the same problem.Soon i will buy a XMOS+PM5102 DAC 32bit/384Khz in case i hope that one will work flawless.
I also had problems with longer USB cables, only short ones work, and only directly on the motherbord. Not via USB hub.

I don't think changing the firmware will help, because it only changes some settings, not the logic on how it processes the signals.
If the problem is only present on 192KHz, then you can solve it by disabling 192KHz. There is no objective gain from going from 96 to 192KHz. Just set Windows to resample everything to 96KHz, and only use DirectSound. Resample quality is fine since Windows Vista. (at least good enough for these 30USD sound cards!)
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Old 5th November 2013, 01:55 PM   #423
tdtsai is offline tdtsai  Taiwan
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Join Date: Feb 2011
Hi
I think the problem should be in board level design. If you buy device form
Isolated 32bit 384kHz USB to I2S/SPDIF CM6631A PCB - DIYINHK
and use DAC as
384kHz/32Bit PCM5102A DAC, I2S input, Ultra Low Noise Regulator - DIYINHK
24Bit/192KHz ES9023 DAC, I2S input, Ultra Low Noise Regulator - DIYINHK
You should not have this problem.

Quote:
Originally Posted by Hobbit13 View Post
I also had problems with longer USB cables, only short ones work, and only directly on the motherbord. Not via USB hub.

I don't think changing the firmware will help, because it only changes some settings, not the logic on how it processes the signals.
If the problem is only present on 192KHz, then you can solve it by disabling 192KHz. There is no objective gain from going from 96 to 192KHz. Just set Windows to resample everything to 96KHz, and only use DirectSound. Resample quality is fine since Windows Vista. (at least good enough for these 30USD sound cards!)

Last edited by tdtsai; 5th November 2013 at 02:13 PM.
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Old 9th November 2013, 04:13 PM   #424
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Join Date: May 2010
Hi folks!
I have one of these boxes, and it mostly works ok. But, from time to time, the sound goes all static-like, robotic sound (the mid to high frequencies). To solve this, I have to stop and restart the audioplayback. Happens regardless of what output format I'm using, and on both toslink and spdif. Sometimes it happens every 10 mins, sometimes it can work OK for 2 hours.. Anyone have an idea what could be wrong?

Also, I haven't tried with external PSU yet. What voltage does it accept? Is 12v ok, or will it fry?
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Old 10th November 2013, 05:14 AM   #425
wklie is offline wklie  Hong Kong
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Join Date: Feb 2013
Quote:
Originally Posted by zajin View Post
Hi folks!
Also, I haven't tried with external PSU yet. What voltage does it accept? Is 12v ok, or will it fry?
Usually DC 5V.
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Old 11th November 2013, 02:35 PM   #426
rezbit is offline rezbit  Croatia
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Join Date: Aug 2013
I have CM6631, non A device. OS X won't recognise anything over 16/48 kHz but my main reason why I got this device is so I can connect netbook to DAC. Netbook runs Ubuntu 12.04 LTS and at first same thing happened, no sample rates above 48 kHz were available. Couple of days ago I installed updates (kernel 3.5.0-43 came with it) and lo and behold, all supported sample rates are reported and working. I'm using deadbeef for playback. Output plugin is ALSA and output device is set to CMEDIA USB 2.0 HiSpeed .... direct to hardware, no conversions (in deadbeaf preferences). To check if device is working properly, open terminal and type: cat /proc/asound/card1/stream0 during playback. On your system it might not be card1 but you will know if it's correct if output from command above starts with CMEDIA USB 2.0 HiSpeed .... or whatever device identifier string is. Output prints current sample rate and all available sample rates at certain bit width.

I'm not using separate power supply but vendor says it takes: "AC 6V-12V, DC8V-14V auto regulate , no need to specify polarity."
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Old 12th November 2013, 09:34 AM   #427
rezbit is offline rezbit  Croatia
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Join Date: Aug 2013
Just a little addendum to my last post, I actually found out that device reports all sample rates and works properly only if computer is restarted with device connected and switched on during boot. I was forced to restart the computer after updates I mentioned in previous post but it was not the updates that made it work but restart. I'm not sure what or where the problem is.
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Old 25th November 2013, 03:20 PM   #428
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Join Date: Mar 2011
Hi
Just got CM6331A from diyinhk.com IDK why i got issue: hissing from the speakers. I'm using it with diyinhk ES9023, everything was fine when just suddenly it started to make that sound like a hi-freq tone and a bit of static, tried changing sample rates on PC and got nothing.
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Old 25th November 2013, 05:38 PM   #429
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Join Date: Mar 2007
Location: Maribor
Hello
I think that 5V is not enough...because after input follows standard diode which has 0.7 dropout and then 7805 which need about 2-2.5V input-output difference.
So about 8-9V min is my suggestion. USB 5V bypass both.
Yes CM6631 has some problem after start up... it must be startet sinhron with pc, so if you use batteries or adapter you must first start it up with computer then turn it on batteries or adapter or sepparate DC input.
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Old 26th November 2013, 11:26 AM   #430
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Join Date: Nov 2013
Location: Zibo
Send a message via MSN to ry7740kptv
Hi All:
Recently I processed with a CM6631A sound card work, but confronted a lot of problems. First the USB speed cannot reach to the normal level that just run at USB 1.1 mode. When I plugged it in, my PC showed The Performance of This Device Can Be Improved. I think some bug may be in the USB connection of my test board. The board is powered by VBUS. But when I plugged it in my computer via a USB-HUB, the speed of CM6631A returned to normal! No speed warning and more sample rate supported! I'm puzzled about this.
The second thing is that I ignored the crystal of 45.1584MHz and 49.152MHz when I designed the PCB. I noticed from the datasheet that the CM6631A can get the two clock from internal PLL. But in fact it cannot work! I connected a CS4344 DAC board to the CM6631A via I2S, and the sound of output is terrible, even no output at some sample rate! Is the datasheet is wrong?
At Last, the firmware is a important thing for me. I've got three version of it. Ver.0101 seems to be the original version that can be used as normal. But it has no input function. The option of I2S and S/PDIF input cannot be found in Windows Audio Device list. Ver.0108 is a full function firmware I think. It includes two I2S input device port ,two output device port ,two digital port(S/PDIF) and MIDI interface. But the important thing is that it can just set to 96kHz sample rate...Ver.0208 is amost like to ver.0101 which can only provide output function.Now I need a firmware that can provide all function and port of the chip, and the sample rate can reach to 192kHz. Who has a firmware like this? It's heard that there is a firmware generator but who can share in it?
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