In the top system in my thread, I cannot get sound from my rear speakers. I have the Klipsch 4.1s. I have tried the Audigy LS, and the Onboard Realtek sound. I know the speakers are connected right, because the respective drivers have a utility to test each channel, and all 4 works fine. But, when I play an Mp3, DVD, or a game, nothing comes out of the rear channels. I have Quadrophonic picked from the Windows Control Panel, as I've always done. I am leaning towards something software wise, and will be rebuilding tonight to test that theory. Abit's forums haven't turned up anything. Anyone encounter this?