looks like engine noise to me since the nosie seems to be coming from the speakers and not under the hood. some possible culprits I guess are the RCA patches or bad grounds. I'm not ruling out alternator, but according to my Crutchfield manual, I'm thinking its my patch cables.....any suggestions????

 

If u havnt yet, look at the other thread about this...about my prob i had.

 

altenator noise and engine noise are pretty much the same thing...i'd start with the grounds and then move on to getting better quality cabling...