[elg2001]

Hi,
       (Double checking the specs on the website)
  Is the VDA•2 Toslink Digital Input Max Sample Rate = 96 kHz?
  Is the VDA•2 Coax Digital Input Max Sample Rate = 192 kHz?

Do you have a listing of all the input sample rates the VDA2 supports?

[CIAudio]

Hi,
       (Double checking the specs on the website)
  Is the VDA•2 Toslink Digital Input Max Sample Rate = 96 kHz?
  Is the VDA•2 Coax Digital Input Max Sample Rate = 192 kHz?

Do you have a listing of all the input sample rates the VDA2 supports?

VDA•2 supports any frequency between 32k-192k (coax input).
The Toslink standard is specified to 96k.

[elg2001]

when you say "any frequency", do you literally mean ANY frequency? such as 45123 Hz, for example?

[CIAudio]

when you say "any frequency", do you literally mean ANY frequency? such as 45123 Hz, for example?

Any frequency providing the clock is stable and data is valid (adheres to S/PDIF or AES3 standard).

[elg2001]

excellent. Now i just need to find a computer sound card that can do this as an output.

So far the best I've found is the Oxygen™ HD CMI8788 sound chip from C-Media (http://www.cmedia.com.tw/?q=en/PCI/CMI8788). According to the chip's block diagram, the sound is not resampled at all when coming off the bus, unlike the Creative X-Fi that I have now. So this should provide some outstanding sound quality (modifying the signal as little as possible). Anyone have any experience with this chip?

[CIAudio]

Here is a link to other cards using the Oxygen chip,

http://techreport.com/reviews/2007q1/oxygen-sound-cards/index.x?pg=1

[elg2001]

I've been looking into RightMark Audio Analyzer test results over SPDIF and the results between cards seems to be quite large. Some have -100 dB SNR, and some have -180 dB. However, the freq response is pretty much perfect on all cards (totally flat).

Why is there this discrepancy? If the PCM audio comes right off the bus into the SPDIF cable, then why woudl the noise ratings be any different considering no processing is being done to the sound?

[CIAudio]

It all depends on the test signal and measurement equipment used...there should be no real difference.

[elg2001]

The tests do loopback: direct wire from SPDIF output to SPDIF input. The freq response on all cards are perfect, but the noise floor varies GREATLY (from -100 dB to -180dB). What could be the cause? Thinking common sensically, the results should be NO different assuming the card isn't resampling the output signal.

[CIAudio]

The tests do loopback: direct wire from SPDIF output to SPDIF input. The freq response on all cards are perfect, but the noise floor varies GREATLY (from -100 dB to -180dB). What could be the cause? Thinking common sensically, the results should be NO different assuming the card isn't resampling the output signal.

I'm not familiar with the soundcard tests you're talking about. You should ask the makers of the soundcards about the results.

[elg2001]

OK thanks.