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Thread: Difference between MB SPDIF and Audigy?

  1. #1
    FLAC
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    Difference between MB SPDIF and Audigy?

    Well i have a USB audigy and I have a basic MB with SPDIF out. I plan on using SPDIF to my Hifonics amp where its converted internally.

    Will i notice a difference in SQ if I use the Audigy? Would sure love to free up the USB slot.

    is s/n levels effected at the digital section or introduced at the analog conversion?

  2. #2
    Constant Bitrate BassBinDevil's Avatar
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    I don't think the Audigy would be any better. It might be more prone to dropouts or glitches if there's heavy traffic on the USB.
    Noise should only be introduced at or after the analog conversion, but it could be introduced in the digital domain if there's digital mixing and processing going on.

  3. #3
    FLAC
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    Thats what I was thinking as well, thanks!

  4. #4
    Raw Wave god_of_cpu's Avatar
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    Quote Originally Posted by Will Albers
    Well i have a USB audigy and I have a basic MB with SPDIF out. I plan on using SPDIF to my Hifonics amp where its converted internally.

    Will i notice a difference in SQ if I use the Audigy? Would sure love to free up the USB slot.

    is s/n levels effected at the digital section or introduced at the analog conversion?
    Although, you would think that all digital interfaces would sound the same, real world testing says otherwise. I have noticed significant differences between the sound quality on the SPDIF on the VIA SP13000 and the SPDIF on a USB Extigy. I can only assume there is some downsampling or something going on.
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  5. #5
    FLAC
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    well thats no good! Maybe PCI is the way to go

  6. #6
    FLAC jbors's Avatar
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    I think the difference could be due to the buggy drivers. They may force sound to upsample from 44K to 48K. Or may be DSP processor itself tries to upsample that way. Either way it should be no difference in quality if you do it right. Interesting topic though...
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  7. #7
    Constant Bitrate BassBinDevil's Avatar
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    So, which sounded better? I forgot about Creative's tendency to resample everything by default.

    If you've got PCI, then go with something like an M-Audio 2496, although an Audigy will probably do just fine, especially with the kxproject driver which supports "bit-to-bit 16/48 playback and recording (SPDIF, Audigy)"
    http://kxproject.lugosoft.com/intro.php

  8. #8
    FLAC
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    Very cool link. I have a SB Live MP3+ card laying around that i will try out soon. wont have it until my SPDIF amp is back from the shop though.

  9. #9
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    I recently got drawn into this whole issue as well, and I *think* I know the answer. Here's the quick version, and once I confirmation that this is what is really going on, I'll post a more detailed explaination with background information.

    In a nutshell: Just about all PC soundcards (whether PCI or USB) *CANNOT* create a multi-channel Dolby Digital signal from discreate input channels. The only way to get more than 2 channels of output through SPDIF (either optical or coax) is by using ProLogic (analog) encoding on top of the 2-channel PCM signal.

    If this is proven to be the case, you do *NOT* want to be using the SPDIF output for multichannel sound, and instead you should be using the 1/8" analog audio outputs. (The exception here is video DVD playback which already contains a pre-encoded Dolby Digital signal which is sent directly through the SPDIF port.)

    -p.

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