I have a kenwood powered sub, old (SW-32HT), that will turn on but the sound is beyond weak. I took it apart and all the fuses are ok, all connections are good. There are no tears in the speaker material. Thats the extint of my knowledge of home theatre powered subwoofers. Any ideas or options I can try to fix this. My guess is maybe the amplifier isnt working that is attached to the unit but not sure how to test that.