Rockford Fosgate P400-4 Question

[BigEvil2005]

I have a P400-4 and its putting alternator whine through the speakers and I know what your thinking grounding issue or bad RCA cord but I dont think it is. I put it in all 3 of my cars and use a 4GA ground less that 12" and bolted to the chassis. My kenwood works great My hifonics works great in my other cars the rockford is driving me crazy. I tried the filters and at this point I believe its the amp so I did Rockford's test to hooked an ipod direct to the amp and the whine is there. is there a way to fix it?

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