Engine noise 4 channel amp

[Quinn88]

So there is engine noise in my rear speakers and not in the front all ran off the same amp if I switch it to 2ch it stops the engine noise and I don't think it's the amps ground because I have my sub amp grounded to the same bolt on opposite side of car any ideas where to start

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[jco1385 5,000+ posts]

Swap your rear rcas for the front and see if it follows the cable. If so, swap out that cable.

 

[blazeplacid 10+ year member]

can you swap the RCAs from front to rear?

try each one.

or

do you have a 3.5mm to rca cable? Try plugging in an ipod or MP3 player straight into the RCA inputs on the amp

 

[Quinn88]

You mean the aux to RCA adapter

 

[Quinn88]

I checked the RCA and its in the line but the RCA has been hooked up to my other amp and didn't have this problem what could have caused it to get messed up?