Question about JVC RX-778V
Most amplified sub woofers need to be grounded to the output source.If you plug the sub woofer in to the receiver you would use a ground wire from the receiver to the sub woofer there should be a ground terminal on the sub woofer and receiver.
Posted on Jul 28, 2008
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Is the hum in the receiver-attached speakers or the sub?
How is the sub attached - RCA or speaker-level?
Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.
If it hums with the sub attached, unplug the sub's power cord. Differences in AC ground potentials will generate hum across linked devices.
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