[tlrobinson]

Are you referring to noise being transferred to the analog stage, or digital data transmissions being corrupted?

The latter is very unlikely with asynchronous USB DACs since USB will retransmit corrupted packets, and jitter isn't a concern since the DAC buffers then uses it's own clock.

The former, well yeah, it's impossible to completely eliminate RFI no matter what you do, short of optically isolating the source, putting the analog equipment in a faraday cage, and running it all off of batteries.

[zmix]

See my reply to sjwright.

[sjwright]

(But only if you want to bash your head against the wall with an epic misunderstanding of how digital signals work.)