I'm not getting any sound out of the subwoofer. What should I check?

Unplug the system to allow the subwoofer to "reset." Also, test the speaker using another device. You can plug one end of an audio cable (you may need a RCA female to Mini-plug male adaptor) into the headphone output jack of devices such as a portable CD player or MP3 player; plug the other into either "line in" RCA jacks on the sub to determine if the problem is with the subwoofer or the soundcard drivers. If problems persist, please email technical support at technicalsupport@klipsch.com.

Subwoofer Direct CD Test:

If you get little or no sound from your subwoofer, perform a "direct in" test to determine if the problem is more than a simple cable or level-setting issue. Start by using a different set of RCA connector cables, then connect the analog audio out from a CD player or DVD player directly into the subwoofer's LINE IN connections. Then, turn the volume level on the subwoofer all the way down. While playing a CD, raise the volume level on the subwoofer; you should hear the bass portion from the source material. If the subwoofer still duplicates the problem, then the issue may be a blown woofer or involve the sub amplifier. However, if the subwoofer functions correctly, then the issue may be with a cable, the receiver and/or a level setting.