CM6631 usb audio interface .... any good ? - Page 27 - diyAudio
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Old 8th March 2013, 01:04 PM   #261
wklie is offline wklie  Hong Kong
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Quote:
Originally Posted by ttan98 View Post
Hi Fellows,
If someone can recommend me a model to buy at Ebay I would appreciate it. I have my eye on this model:
eBay Australia: Buy new & used fashion, electronics & home d?r

what do you think?
I think this is one of Weiliang's design. You need to confirm with the seller about two things:
1. It is using PCB revision 1.4 instead of older (e.g. 1.3)
2. If you care about 176.4kHz (and 88.2kHz), you need to make sure it comes with CM6631A instead of CM6631. Assuming the item description is up-to-date, it does not sound like it is using CM6631A.
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Old 8th March 2013, 03:50 PM   #262
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My pick, if the case isn't essential :

24bit 192kHz USB to I2S / SPDIF PCB CM6631 with ultralow noise 6.5uV regulator | eBay

BTW, my EE friend says he thinks there's probably no intrinsic difference in sq between firmwares. One is simply fixed at 24 bit to allow dts passthrough and the outputs were changed because of an end-user requirement. Maybe.
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Old 9th March 2013, 06:40 AM   #263
ttan98 is offline ttan98  Australia
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Quote:
Originally Posted by wklie View Post
I think this is one of Weiliang's design. You need to confirm with the seller about two things:
1. It is using PCB revision 1.4 instead of older (e.g. 1.3)
2. If you care about 176.4kHz (and 88.2kHz), you need to make sure it comes with CM6631A instead of CM6631. Assuming the item description is up-to-date, it does not sound like it is using CM6631A.
Thanks for your input, technically when do you use 176.4khz, when you need to over sample 44.1khz audio stream coming from CDs? If this is not the case when do you use it? If this is the case why do you have to over sample it, better audio?
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Old 9th March 2013, 06:42 AM   #264
ttan98 is offline ttan98  Australia
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Quote:
Originally Posted by KlipschKid View Post
My pick, if the case isn't essential :

24bit 192kHz USB to I2S / SPDIF PCB CM6631 with ultralow noise 6.5uV regulator | eBay

BTW, my EE friend says he thinks there's probably no intrinsic difference in sq between firmwares. One is simply fixed at 24 bit to allow dts passthrough and the outputs were changed because of an end-user requirement. Maybe.
My DAC does not have an I2S interface so this is not suitable.
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Old 9th March 2013, 10:40 AM   #265
wklie is offline wklie  Hong Kong
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Quote:
Originally Posted by ttan98 View Post
Thanks for your input, technically when do you use 176.4khz, when you need to over sample 44.1khz audio stream coming from CDs? If this is not the case when do you use it? If this is the case why do you have to over sample it, better audio?
I don't actually do these (my 10-year old AV receiver maxes out at 96kHz), but my understanding of the benefits of 176.4kHz is:
1. DSD to PCM conversion, if you purchase DSD files or rip from SACD using a hacked PS3
2. Some people prefer integer multiple of upsampling, i.e. 44.1kHz -> 176.4kHz instead of 44.1kHz -> 192kHz.

Last edited by wklie; 9th March 2013 at 10:44 AM.
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Old 11th March 2013, 02:33 PM   #266
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Is there anyone who familiar with these boars?

taobao agent CM6631 an absolute fever b USB turn coaxial finished Board - TMALL outlet,TMALL english,TaoBao Agent, English Taobao, Taobao Outlet - Products Online from China TMALL at 12got.com
China Wholesale - The CM6631 absolute fever version USB to coaxial finished board - 31.22 - China service

This one has 26C32 buffer and RJ45 socket for i2s. The buffer used for i2s or Spdif (or both?) is not clear for me.

China Wholesale - A CM6631 fever version - 40.98 - China service

Last edited by terranigma; 11th March 2013 at 02:41 PM.
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Old 13th March 2013, 07:18 AM   #267
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I am interested in getting one of these. I need:

- Mac full compatibility
- SPDIF output (if I can easily add SPDIF with the I2S board I am all ears)
- 88.2k compatibility is preferred, but if it save me enough money I am willing to let this go

This seems to fit the bill, but uncased and no option for external power supply.

24bit 192kHz CM6631A USB to SPDIF Coaxial DAC USB Power SC | eBay

This one is almost perfect but doesn't do 88.2k.

New Hi Fi CM6631 USB to Coaxial Optical SPDIF Convertor for DAC 192kHz 24bit | eBay

Are the ones from diyinhk better? But it is uncased and has no SPDIF.

24bit 192kHz USB to I2S SPDIF PCB CM6631 with Ultralow Noise 6 5UV Regulator | eBay

My question is, are they made equal (or almost)? Which ones should I be looking at?
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Old 13th March 2013, 01:55 PM   #268
wklie is offline wklie  Hong Kong
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I can't find boards equivalent to terranigma's links from taobao (so cannot find any comments.)

As for Navyblue's 1st link, I can find it from taobao but there are almost no useful comments. Due to post #228, I'd recommend having the option of external power.

2nd link: my comments in post #261 are applicable.

I don't believe they are made equal due to different designs and components, and quality of soldering as many of them are hand made. I use the one in post #34 (with optional TCXO upgrade.)
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Old 13th March 2013, 02:33 PM   #269
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Quote:
Originally Posted by wklie View Post
I can't find boards equivalent to terranigma's links from taobao (so cannot find any comments.)
Taobao links:

The narrower boards same but different revisions. Narrow blue one seems actual revision.
Narrow blue
Narrow green


This is the 26C32 buffered "wider" board on taobao:
Wide blue

Last edited by terranigma; 13th March 2013 at 02:47 PM.
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Old 13th March 2013, 03:40 PM   #270
wklie is offline wklie  Hong Kong
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Quote:
Originally Posted by terranigma View Post
Taobao links:
The narrower boards same but different revisions.
The seller got excellent ratings. I read all the comments - there are no negative comments (taobao usually has very few negative comments, but having absolutely none is most certainly good.). All comments about the build quality are good. Most reported improved audio quality but two said it (the narrow blue version) still cannot compare with CD players.

I think, but am not 100% sure, the differences among the three are:
- The narrow green version is the oldest
- The narrow blue version is newer and has coaxial output
- The more expensive wide blue version has coaxial, optical (but the photo does not show the connector?!), I2S output and may have better components.

0.1ppm TCXO upgrade costs RMB140 extra.

Last edited by wklie; 13th March 2013 at 03:44 PM.
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