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|5th May 2013, 08:56 AM||#1|
Join Date: Apr 2006
Calling XMOS and CM6631 experts
There are currently 3 options to convert USB to SPDIF/I2S which are based on:
2. CM6631 or CM6631A
The 1st one is considered a little old and the max speed limited to 96kbit/s. The last 2 chipsets, CM6631/A and XMOS are current chipset used in the current crop of convertor designs. I bought a convertor based on CM6631 and I found it to very good at the same time it is quite cheap.
I don't know the differences(technically) between the CM6631 and XMOS chipsets, my query is that, is there a clear/distinct advantage, e.g. jitter spec. of the XMOS chipset over the CM6631/A? If so please explain. If I am getting a new convertor should I buy a convertor based on XMOS or CM6631A? Thanks.
|5th May 2013, 12:41 PM||#2|
Join Date: Feb 2013
I am not the expert. But I have all these and I learn little bit. Tenor is isochronous and good but not the same level as the asynchronous. CM and XMOS are asynchronous. You know this and understand this difference ?
CM use the higher speed XO (good for ES9018 DAC in synch mode but xo on CM is not the best so not the best for Es9018 ?). It make the mclk as division inside the IC - maybe add little bit jitter ? It have both mclk always on. I guess it have a slower bus speed because it not get hot and maybe it have smaller buffer... maybe. I guess it is single core processor.... guesses.
XMOS is multi-core. It use the common speed xo and turn off/on. It does not divide mclk so mclk is sent direct, not through IC. Buffer depend on the IC but usually 64K or maybe 128K.
Both have asio driver for windows. Don't know for mac / linux ...
There are some CM to choose and some are very good, some not as good because of the layout, component choices, etc. There are some XMOS - Matrix, Lurien WaveIO, Diyinhk DXIO, MiniDSP USB streamer ....
So, I think you need to say which DAC, which OS, etc. Then people can make the recommendation to you.
I think XMOS is sounding better than CM6631 anyway.
CM6631 usb audio interface .... any good ?
New XMOS usb 384khz
XMOS-based Asynchronous USB to I2S interface
And there are more options. There is Amanero, Musiland... and more.
Last edited by Nanoloop; 5th May 2013 at 12:51 PM.
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