Alternator Noise thru Rears
 

Hey guys, I just put in 4 Crescendo Audio 6.5 Symphony in my truck this weekend and put them on a Soundstream PN4.520d amp. I had some mad buzzing coming thru after I put them in.

I've re-grounded the amp twice, ran the RCA on the other side of the truck, tried grounding the RCA outputs on my head unit, and also tried some ground loop filters. The filters fixed the front, but the filter itself is NOT grounded.... Grounding it makes it 20x worse. The filter didn't help the rears at all and grounding them makes them sound 100x worse.

If I run the RCA straight thru the cab to the amp I get no noise whatsoever, They are now run opposite side of power cable so that's not an issue...

Any ideas?? I'm lost :(