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Hi, yes there is a rather simple method for testing the actual subwoofer unit, simply plug in a known good rca cord into the input-make sure if there is a switch for level input that it is on the back make sure it is switched to line and not level, next plug in rca cord, turn on unit-stick tip of finger on tip of rca cable. This should gernerate a"HUMM" in the subwoofer if everything is working correctly. Thanks for choosing FixYa, I hope this was of some help,good luck Prodzilla.
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