If it is the case, that means UNISON isolation is not good enough, RPI streamer sound quality is much better than PC computer much more, I wonder if people use PC computer with UNISON, the sound quality is wrose than mine. But I think Bifrost 2 still good with UNISON, it is better than no isolation, the sound quality is reflected in the selling price already,I just paid more money to improve it
I suggest you contact Schiit support and talk with them. Mike Moffat says Unison is the DAC’s best input. Either your unit is defective or something is off in that USB connection that Schiit should be aware.