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Re: wiring diagram or schematic
Make sure no of the speakers wires,inputs or antenna even cable is runnig parallel wite an electric cord or line.that is 90% reason 4 feedback(humming). Iif you have to cross wires do it in a intersecting way.perpendicully<if thats a word.rating please
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It sounds like you have your gain to high. best way to solve this is by turning the gain way down to - or lowest number , then turn everything on and upto the volume you desire, then slowly up the gain. also avoid using bass boost, I agree it sounds great but it puts strain on the amp and shortens life in the amp. with the bass boost off, you can adjust others (not the gain) to get bass.
Humming from subs? If from inside amp, your experiencing a problem with a driver board. It makes transistors latch on and loads down the transformer, causing light to come on. And vibrations "hum" from transformer.
It sounds like you may have a ground loop issue. I'd start by checking all the power and ground connections. Then disconnect the RCA wires from the amplifier. If the hum goes away then you should try grounding the stereo to a better grounding point, the factory grounds are usually not very good at all. Then try it again, if it is still there try replacing the RCA"s.
I often troubleshoot these issues via a stereo head set, modify the leads so you can "Touch" them onto the Speakers Output Terminals, connect the "Shields" together, thats "Earth" and the other Two, are Left & Right... with the Amp's volume turned to about 25% volume, connect up the Earth wires to the Chassis with a clip, under a srew etc, just make good contact... then touch the Left & right wires onto the output, ya should hear sound... if not most probably the Output device(s) may have gone faulty.