For starters, make sure you are using current drivers and any built in sound systems are disabled. Also check your speaker settings (tell the machine how many you have) and such. The SoundBlaster cards should have their own utilities. Go through them and make sure there are no funky reverbs turned on and everything looks okay. Next, check your speaker wires and make sure they are in good shape and plugged in right. Last, borrow some speakers from a friend and make sure the problem is not in your speakers.