Question about Audio Players & Recorders
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Posted on Jan 02, 2017
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Apr 13, 2011 | Onkyo Audio Players & Recorders
Jan 03, 2008 | Pioneer VSX-54TX Receiver
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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