I have a Klipsch THX 5.1 for my computer, I don't know why like half the time it doesn't work. Most of the time the speakers would stop working while only the subwoofer works. I tried reinstalling the software for my sound card, disconnecting and reconnecting some plugs and wires, and turning on and off the whole system, but it only works sometimes. If anyone know what the problem is, please tell me because it's getting really annoying. Thanks.