Question about Planet Audio AP1000D Car Amp
The most common problem for the symptom you describe is a "ground loop". There's a slight difference in the ground potential between the source unit and the amp itself. It may be caused by a ground on one or both of the audio inputs. It may be caused by the amp case itself being fastened to a metal portion of the vehicle. It may be a grounded speaker lead.
Of course the amp itself could be defective.
1) Isolate the problem. Disconnect everything except power, ground, and remote.
2) Connect the subwoofer(s). If the symptom immediately returns, it's most likely the amp ground or a speaker lead.
Posted on Mar 21, 2011
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Posted on Jan 02, 2017
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