CM6631 usb audio interface .... any good ? - Page 30 - diyAudio
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Old 31st March 2013, 08:20 AM   #291
erin is offline erin  Australia
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Location: http://www.makeitpossible.com/
Native 24bit 192k USB to Spdif Converter 1ppm TCXO Low Jitter Version | eBay

is this one better than the $39 board?

What are people comparing these to?
Has it been compared to Audiophilleo?

Without buying one to find out for myself, I hope someone can tell me if these boards exceed the sound quality of really top notch gear, or if they are just "very good" at their price point?
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Old 31st March 2013, 12:32 PM   #292
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Quote:
Originally Posted by erin View Post
Native 24bit 192k USB to Spdif Converter 1ppm TCXO Low Jitter Version | eBay

is this one better than the $39 board?

What are people comparing these to?
Has it been compared to Audiophilleo?

Without buying one to find out for myself, I hope someone can tell me if these boards exceed the sound quality of really top notch gear, or if they are just "very good" at their price point?

That's the same product that I am interested in purchasing myself and would like to know the same answers if at all possible?, how good is this product in comparison to the M2Tech gear? Such as the hiface Evo?, anyone done an comparisons of these products please.
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Old 31st March 2013, 11:10 PM   #293
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Originally Posted by bvs View Post
I've recently found a solution for issue that caused when CM6631A module is connected to any Mac USB 2.0 ports.
When you connect module to Mac it is detected as USB Audio Class 1.0 device and you have no ability to use anything more than 48/16.
Module has a reset chip LM810M3-2.93 (http://www.nscrus.ru/content/catalog/pdf/LM810.pdf), but as we can see from the CM6631/32 datasheet, the CM6631A has a power-on self-reset.
So, reset chip has been removed from a board and now the module is always correctly detected as USB Audio Class 2.0 device on any Mac USB port.
This method has been tested on MacBook Pro, Mac Mini and this CM6631A module:
New CM6631 USB Module Assembled Board for DAC3 AD1955 DAC7 WM8741 by Weiliang | eBay
LM810M3-2.93 is a 3-pin chip located on the top of CM6631A.
Thank you for the tip! Just removed the "SA B" 3-pin chip and it works wonders now on my MacBooks. No problems with 24/88+ now.

Included a picture to show location of the chip on my board...
Attached Images
File Type: jpg CM6631A Reset Chip removed.jpg (125.9 KB, 430 views)
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Old 1st April 2013, 06:45 AM   #294
wklie is offline wklie  Hong Kong
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Quote:
Originally Posted by erin View Post
Native 24bit 192k USB to Spdif Converter 1ppm TCXO Low Jitter Version | eBay

Without buying one to find out for myself, I hope someone can tell me if these boards exceed the sound quality of really top notch gear, or if they are just "very good" at their price point?
It looks exactly like the one I'm using plus other upgrades - perhaps you may read my previous posts about my unit. I don't know how it compares to other top notch gear (which is many times more expensive). Keep in mind this is a DIY product designed by somebody and handmade with a DIY soldering/build quality. If you guys decide to buy one, ask whether it comes with CM6631 or CM6631A first.

Last edited by wklie; 1st April 2013 at 06:48 AM.
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Old 1st April 2013, 07:22 AM   #295
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Originally Posted by Archimago View Post
Thank you for the tip! Just removed the "SA B" 3-pin chip and it works wonders now on my MacBooks. No problems with 24/88+ now.

Included a picture to show location of the chip on my board...
Thanks. I ordered the same one. But it looks like it is tough to work in that tight of a corner.
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Old 1st April 2013, 12:05 PM   #296
erin is offline erin  Australia
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Quote:
Originally Posted by wklie View Post
It looks exactly like the one I'm using plus other upgrades - perhaps you may read my previous posts about my unit. I don't know how it compares to other top notch gear (which is many times more expensive). Keep in mind this is a DIY product designed by somebody and handmade with a DIY soldering/build quality. If you guys decide to buy one, ask whether it comes with CM6631 or CM6631A first.
I am only interested in sound quality. I don't care about price. I have previously bought and used one of Weiliang's other boards using the TE7022 chip and I was deeply disappointed with the sound. I think this was due to bad circuit layout which attempted to save space by producing a working product on the smallest possible PCB. The one I am talking about looked like this one but did not have the DAC on board. I presume it has been discontinued for good reason. I notice when I opened the aforementioned page that firefox truncated the name, and made for an interesting commentary on the product. See the attached picture.

This looks like it is not saving space and has some "potential" for good sound. But unless someone else can highly praise the sound when compared to other highly recommended converters I will not be bothered to try it.
Attached Images
File Type: png usb.png (1.6 KB, 381 views)
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Last edited by erin; 1st April 2013 at 12:19 PM.
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Old 1st April 2013, 12:31 PM   #297
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I too would like to know how good the sound quality of the unit is with on board power supply?.
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Old 1st April 2013, 01:16 PM   #298
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If you want subjective sound assessment, I am afraid this forum would disappoint. And for that you have to go to computer audiophile.com. Audiophilleo and this isn't in the same price neigbourhood. If money is no object why not buy them all and send those you don't like to me.

Cost isn't the only consideration to keep PCB as small as possible.
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Old 1st April 2013, 06:02 PM   #299
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Originally Posted by Navyblue View Post
Thanks. I ordered the same one. But it looks like it is tough to work in that tight of a corner.
Took 5 minutes to disassemble and remove that chip. Able to destroy & pull it off quickly with my needle-nosed plier

Just be careful not to damage other components and PCB traces.
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Old 2nd April 2013, 10:40 PM   #300
erin is offline erin  Australia
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Quote:
Originally Posted by Navyblue View Post
If you want subjective sound assessment, I am afraid this forum would disappoint.
No this forum would not disapoint. There are many good reviews on this forum.

Quote:
Originally Posted by Navyblue View Post
And for that you have to go to computer audiophile.com.
Are you are saying there is a CM6631 review on computeraudiophile? Please provide the link.

Quote:
Originally Posted by Navyblue View Post
Audiophilleo and this isn't in the same price neigbourhood.
Exactly. You should know that sound quality has little to do with price.

Quote:
Originally Posted by Navyblue View Post
If money is no object why not buy them all and send those you don't like to me.
Are you saying you would like to fill your house with second rate sounding rubbish?

Quote:
Originally Posted by Navyblue View Post
Cost isn't the only consideration to keep PCB as small as possible.
In the context of the converter I mentioned above, I assume it was the primary concern, but it could also be naive design?
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