Right now, I'm listening to Miles Davis cut 5 Flamingo Sketches from Kind of Blue on SACD. I'm switching to the same recording from a CD imported as a wav file into iTunes. Here's what blows me away, the presentations are identical, that's to say, I cannot distinguish between computer audio to preamp and playback from my SACD player (Sony VDP-S9000es); and, I'm critically listening. Here's what's, perhaps, even more remarkable, my computer is an inexpensive Dell Inspiron 14; and, I'm playing to my preamp (Sony TA-E9000es) from a headphone mini jack to RCA. I'm thinking now, what's the point of a USB to DAC, or USB to S/PDIF? My Kind of Blue discovery makes me Kind of Happy.