CM6631 usb audio interface .... any good ? - Page 33 - diyAudio
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Old 10th April 2013, 04:47 PM   #321
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Default Where is it isolated?

My question about the diyinkh 'Isolated 24bit 192kHz USB to I2S/SPDIF CM6631A PCB' is where it is isolated:
  1. at the output so just 'before' the output plug and after the DSP
  2. at the input just 'behind' the USB plug, so to say
[LIST=1]
the first quickly adding some jitter again.
Sorry, I can't find the documentation it my laziness today to ask.

albert
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Old 11th April 2013, 02:35 AM   #322
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Isolate on i2s, after cm6631a. No usb isolator for this speed device, only for slow usb.
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Old 11th April 2013, 07:21 AM   #323
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Quote:
Originally Posted by Nanoloop View Post
Isolate on i2s, after cm6631a. No usb isolator for this [high] speed device, only for slow usb.
Ah, I was asking for the dreamware, the impossibilistics
thanks
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Old 19th April 2013, 05:17 PM   #324
UnixMan is offline UnixMan  Europe
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Quote:
Originally Posted by triode_al View Post
where it is isolated:
  1. at the output so just 'before' the output plug and after the DSP
the first quickly adding some jitter again.
NOT if you do it the right way!

That is, you have to put the clock(s) "on the clean side", send the required clock back to the USB interface through another isolator and do (synchronous) reclock the I2S signals after the isolators.

As properly done by: "USB Audio interface | ABC PCB"
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File Type: jpg U2S192_bloc_diagram.jpg (55.9 KB, 518 views)
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Last edited by UnixMan; 19th April 2013 at 05:19 PM.
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Old 24th April 2013, 07:36 PM   #325
UnixMan is offline UnixMan  Europe
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Quote:
Originally Posted by bobbybland View Post
Hi
I've got one of DIYINHK's Isolated 24bit 192kHz USB to I2S/SPDIF CM6631A PCB replacing the faulty first half of an old Cambridge Audio DAC3. All is well except that anything over 96khz is very distorted. Does anyone have any suggestions? I am running windows 7 via usb2 to the four tda1541a, connected with LRCK, BCK and DATA.
If it behaves in the same way as the non-isolated one, I'm afraid that the problem may arise from the different frame clock which is used for different sample rates. At s/r above 96KHz it uses a ~44MHz clock (while it's ~22MHz@96K and, IIRC, ~11MHz@48K).

A clock >40MHz may be good for the Sabre (for which this interface seems to have been specifically designed), but many DACs do not like it. Mine does not even work at all with it (when s/r is >96KHz).
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Last edited by UnixMan; 24th April 2013 at 07:39 PM.
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Old 4th May 2013, 03:31 AM   #326
jkorten is offline jkorten  United States
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Quote:
Originally Posted by abioqaas View Post
I received a "Breeze Audio" CM6631 USB-SPDFI/Optical out box today but I'm having problems with it.

My rig is running Windows 8 and I used the Emotiva XDA-2 drivers from this thread, they were the only ones that worked on Windows 8 for me. Driver installation went fine, I can see the device and get audio out of it.

My FW revision is 2206 and I noticed that indeed I did not get audio out when running in ASIO mode. I was able to get WASAPI + Foobar working though.

Here comes the problem: I can't get some sample rates to work, it's really weird. Multiples of 44.1kHz work, for example 88.2kHz and 176.4kHz work. Multiples of 48kHz don't work so for example 96kHz and 192kHz don't work. Or they work, kind of. I get audio but there is crackle and noise on top. Sounds almost like some kind of clocking problem?

My setup is:

USB - Breeze Audio box - Aune X1 MK2 coax SPDIF in

I've ruled out the Aune as the cause as it works perfectly with my mobo SPDIF out - I can get every sample rate working from 44.1kHz up to 192kHz / 24-bit.
Did you go to the control panel, sound device and choose advanced settings and enable the hi sample rates?
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Old 7th May 2013, 01:20 AM   #327
hewball is offline hewball  Australia
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Hi,
Does anyone know of this chip being used as an i2s input aswell as output?

Looks like the chip supports it, but i cant find any reference to it being used

Cheers Hewball
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Old 8th May 2013, 10:02 AM   #328
wklie is offline wklie  Hong Kong
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Quote:
Originally Posted by hewball View Post
Does anyone know of this chip being used as an i2s input as well as output?
Perhaps this is not what you're asking, but anyway, the data sheet states that it can do I2S input and I2S output.
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Old 8th May 2013, 02:41 PM   #329
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hi. can anyone share original fw for asus thunderbolt combo card? it based on cm6631.
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Old 9th May 2013, 02:15 AM   #330
wklie is offline wklie  Hong Kong
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Quote:
Originally Posted by gungstar View Post
hi. can anyone share original fw for asus thunderbolt combo card? it based on cm6631.
Which firmware is your card running?
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