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Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

RE: Outboard USB/SPDIF Conversion: Why Can It Yield Higher Sound Quality?

There are two primary issues effecting the 'sound' of digital audio interfaces. Jitter and noise transfer. I think it's pretty much a certainty that any difference in sound due to inserting an USB-to-SPDIF converter is due to differences in jitter and/or noise transfer. USB is an notoriously poor audio interface for jitter - unless it is asynchronous transfer USB. It is poor for noise transfer, whether or not asynchronous transfer is employed.

So, yes, it's quite possible that your outboard converter is delivering a lower jitter, lower noise signal transfer.
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Ken Newton


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