Currently using the 3.5mm, but will try bit streaming from the USB port. I wasn't sure how the Oppo treated a decoded music file. Regardless, to my ears it's great. Last night I listened to the flac version of "Passaic Night ", the first official release and remastering of my favorite Springsteen bootleg show from 41 years ago, and it's a frickin' revelation. Couldn't sound better if it was recorded yesterday. If it's the AP80 making the difference, I'm sold.