Let me try to clear up the confusion.

The RR2150 is a pure analog device (i.e., it does NOT have a DAC). The computer sound card is doing the D to A conversion and passing the info via USB to the RR2150.

No 2ch receiver (that I know of) has a DAC - they are all analog devices. On the other hand, ALL multi-channel receivers sold today have DACs.

Now, the question is what happens when you connect a computer via USB to the 990? Can the 990 accept digital files and do the D to A conversion? Can it upsample the data coming thru the USB input?

(I am guessing YES - Gonk - please correct me if I am wrong!!!!).
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BSMNT HT - Oppo DV-970HD,Tos HD-A2,Emo LMC-1/Onkyo TX-SR705, Outlaw 7125,PSB Image 4T 8C 10S, Outlaw LFM-1+,Panny PT-AE900U, DIY 106" fixed screen

LIVRM 2ch - Philips 963SA,Lexicon DC-1,Carver AV-505,Von Schweikert VR-2,Sony KDF-E42A10