Can I plug my powered 2.1 desktop speakers through my E7 "soundcard"/amp/dac?   I'd rather not fuss with multiple sound cards/devices in Windows if I don't have to.

Hey all, pretty new to this world of "hi-fi" audio.  Been reading/researching for a few days now...just getting started, I know. :)   Anyway, I'm pretty set on the 558s right now, I think...  :P   I will be gaming: FPS, RPG, MMO.  TF2, DoD, CoD, and other random shooters.  Diablo 3, and...