JVC-TH-M505.. have problems with it's subwoofers, have you check the cable from the receiver to the subwoofer for compatible they may have difference wiring within. the power is control via this cable. I have this same model and the sound cuts off when there is loud action part of the movie, it was in the shop for 4 weeks and they did NOT fix it.. so now I am stuck with the problem. JVC is no help at all..

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