Ok. I have the logitech z-640s. When I hook them up to my television/dvd/console... all of the speakers work fine and dandy. When I hook it up to my computer, the back right speaker is always lower in sound by about 80% or so. If I plug speakers to TV, then back to the PC.. my back right speaker will work during the test.. but then once I start playing music/game/etc... the sound gets real low on the back right. I know it isn't the speaker because I have switched speakers and it can't be the subwoofer that you plug the speaker into because the speakers worked fine on my TV. Does anyone have any idea on what this could be? Soundcard drivers? I have the Soundblaster Live! 5.1 soundcard.