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ohwow123, if you bought it from an authorized dealer then contact Klipsch for warranty service/customer support. You have a 1 year warranty. If you bought it from elswere you can talk to the seller, especially if they advertised it as working.

I called Klipsch and asked them about my issue. The tech guy suggested that hook up the woofer speaker to another amplifier (i.e. stereo) to determine if it was the speaker that's bad. A replacement speaker would cost $20* instead of $80* for the amplifier unit (all the electronics in the sub woofer unit). Of course it's the amplifier in my case. Now I have to decide to repair or get a whole new unit. *plus tax and shipping

The sub doesn't have a fuse. The two internal fuses are for the left and right speakers since the speaker wires could be shortened. Sounds like a different problem than mine. In your case it could still be the DIN connector or the control pod that's bad.

spseal, I'm curious if you have the same issue. Have you tried to disconnect the speakers (not the control pod) and turn up the volume while playing music to test if the subwoofer does output any sound?

I have the old style ProMedia 2.1, the heavy one with the power switch on the back. It has been working great for many years but now the sub-woofer sound is not being amplified anymore. If I disconnect the left and right speakers I can turn up the volume and hear the muted sound from the sub-woofer. I read through the forums, looked at the internals and did some test with the help of the diagrams at http://www.thompdale.com/bash_amplifier/2-1/2-1_bash_amp.htm (Great diagrams and write-up btw.) DIN connector is OK. Wiggling doesn't affect anything. The connection looks solid. The voltage on the Control Port looks OK (P501:1, P501:9). Visually everything looks fine. No components look burned and the soldering looks ok as well. Sub-woofer relay seems to be engaging fine (click just a fraction after plugging the sub-woofer in). Also I doubt I would hear a muted sub-woofer sound if the relay would not engage (close). I'm not sure what else I could try. Does anybody have any experience with this issue, know if it's possible and economical to replace some components, or get it serviced.