I have a 800W pioneer amp, model GM-7200M, along with a new 12 inch pioneer subwoofer. I installed them both two days ago and they are brand new. It sounded great and everything worked. Then just recently the subwoofer didn't sound anymore. The subwoofer is ok and the amp light turns on. I don't understand what could have happened. I didn't disconnect it at all since it was installed. I checked to make sure everything was connected, but still no sound from the subwoofer only my speakers that aren't connected to my amp work.
Here is a short test you can try, remove the rca audio cable from the amp & connect a diskman or toher audio o/p device that you can hook up with the same rca wires, turn on the amp & see if you have sound. you can also remove the speaker wires from the sub & using multi meter read the ohm's of the sub, most subs are 4 ohm. Hope this help locate your problem
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