Pkubica
Gee you're a trouble maker!
it's really gonna piss me off if plugging the Hiface into the DAC and using a longer USB cable sounds better!
My thinking on that was my Oyiade digital cable is shielded and/or constructed better than any USB cable I've seen... so I plug my M2Tech right into the tower and use a 1.3M BNC cable.
the other note was a BNC wire handles transmission of digital info better than does USB.
With a SPDIF RCA connection, perhaps there is something to going with a longer USB wiree.
I've heard/seen online it will work either way.
I suppose too one changes the sound perhaps too by eliminating the SPDIF/BNC cable.
Try it out and let us know... I'd as soon not find out I spent a couple hundred bucks more than I needed to.