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Isnt there already one on said topic?

You know its funny, all of the above suggestions are great. They have to do with that same thing, wire etiquette!! lol I may have just came up with a new term!! Anyway, proper grounding, rca's opposite of power wire, blah blah...someone should write a FAQ :)

Sounds like a bad ground. You will notice a bad ground through the main speakers and not usually through the subs.

I have settings on my amp that allow me to change the levels of the front speakers and back speakers like making the voice or words of the songs louder

is this your gain? if so a lot of noise can be generated simply by having the gain set too high....

Where do you have the RCA's running? They should be ran by themselfs, and not next to the power wire. You could be picking up somthing from there. Make sure your grounded to the same area, and it;s sanded away for a nice clean connection.

Did you run your RCAs on the opposite side of your power wire?

Alright guys, i just installed my 2 amps, (2 channel bridged mono for my sub, and 4 channel for my 4 speakers)

I ran 2 seperate power wires, 8-gauge for 4 channel, 4 guage for 2 channel amp) My 2 channel sub amp is fine.

Now my problem is with my 4 channel amp. I have settings on my amp that allow me to change the levels of the front speakers and back speakers like making the voice or words of the songs louder. When my engine is off, im just playin music everything sounds fine. But when i turn my engine on, a humming sound comes from the speakers. If i turn the settings up on the amp the humming sound gets louder, but if i turn the main volume up on my hu nothing changes. If i make it low enough on my amp so u cant hear the humming sound, its so low that you cant hear the words.

Please guys.. somebody help me, i have no clue what to do, or what it is.