engine whine through back speakers

[bassaholic 10+ year member]

Ok i have a pioneer 4600mp H/U and since i install my 4 channel amp im getting engine whine through rear speakers only. I replace the rca cable for the rear with some expensive shielded ones and still the same problem and i even ran it over the seat away from any power cables still the same problem. Is it a problem wid my H/U....//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif ?

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[maldecido33 10+ year member]

check your grounds(HU and amp)

 

[squeak9798 5,000+ posts]

Yeah, try redoing your HU and amplifier grounds.

 

[bassaholic 10+ year member]

I check all the grounds plus the whine is only audible through the rear speakers not the components at all. but ill double check.