I can’t tell any difference in sound regardless of input used (I have not tried ethernet bridge)
I use the USB on my main PC to a re clocking/jitter reduction device, a Mutec 1.2 (there is a pre-PS Audio history as to why I have it). From the Mutec, I go to the PS Audio Junior. What the Mutec allows me to do is try a bunch of interfaces. I tried them all (except ethernet bridge) and I can’t tell a difference in sound. I also tried PC USB direct to the Junior. Just can not tell… I did have a negative issue with the optical link, as it won’t pass higher sampling rates. Ted noted this has more to do with the cable.
Read Ted’s respsonse on optical here: New DS owner, share your experience of the dac running in from new?
YMMV
Peace
Bruce in Philly