Ok, Tried one of those Ground loop isolators yesterday and Not only did it block out the RPM hum, it basically blocked out all sounds leaveing it to sound like crap. The amp is grounded well so I guess I'll try grounding the headunit to something else then. Thanks glass for your help
The power cables are wired on the right while the RCA's are on the left. So that shouldn't be the problem. I changed the ground wire But For some reason my Amp wasn't working today, It would show power but you hear nothing out of it. So gotta wait a couple days untill my other amp comes in to test the new ground on the headunit.