I was thinking of purchasing that card in the very near future, and have previously connected a sound card to a 5.1 system. In order to get the true 5.1 from the audigy, you'll need to use the digital out. You can get an 1/8 inch to dual-rca cable though and run it analog, but you'd lose the 5.1 aspect. When I upgrade my reciever (End of year hopefully) I'm going to bump the old one back to my computer system. As for the klipsch I don't know what to tell you other than hook it up to some (similarly rated) cheapo speakers and see if it pushes them. My guess is that it's not 50 "true watts" per channel.
