the sub on and off based upon the presence of an
audio signal is not working correctly and the sub is trying to reproduce 60 cycle
hum. The unit needs service. Dan
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line filter or plug the SWA1501 into a different AC circuit.
Hum Try disconnecting the cable connected to the INPUT jack. the best noise rejection. Whenever possible, plug all the
audio equipment's linecords into outlets which share a common ground. The distance
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