Ditto! Hook up any other system to the speakers, then you'll know right away if it's the sub or the PC's sound card. Could also be a defective cable between the PC and the speaker system.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)