Does your receiver have a digital in?
I have an older soundblaster with a digital out. It's a 1/8th inch to phono connecter. 3 bucks at radio shack. Get the all gold version and bigger RCA plugs will fit it.
Then I'm just linking that to the digital in on my receiver.
Having the digital out (SPDIF) enabled on your sound card bypasses any sound processing by the sound card, and just sends a straight digital signal.
I don't know how exactly you want to use a DAC.
If you don't already have a sound card with digital out on your computer, do a search on ebay for a creative card. The quality of the card really doesn't matter because it is just sending a direct digital signal, it does no processing.
