Unplug the system to allow the subwoofer to ?reset.? Also, test the speakers with another device (you can plug one audio cable into any headphone output jack of devices such as a portable CD player or mp3 player) to determine if the problem is with the subwoofer or the soundcard drivers. If problems persist, please contact technical support at promediatech@klipsch.com
right from their website... wonder how long they thing the sub should 'rest'....