I wouldn't recommend going from your anolog out of your soundcard to a power amp. To many tics and hiss will be produced. Try booting down windows with that in place just as you shutdown a loud pop could eminate from your speakers. It did it with my Bryston amps and Maggies. Its pretty scary. It is better going SPDIF out of your soundcard to your receiver or preamp/processor which is connected to a power amp.

Saturn

http://www.quadloft.com/hometheater- new HT