rockford fosgate t400-4 humming noise

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Hi need help fixing my Rockford Fosgate T400-4 amp has a humming noise coming out of all 4 CH. A friend told me to put a wire from the amps ground to the ground of the rca's and I did that and the humming stopped but I don't want to leave it like that I want to fix it right. THANKS!!
 
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