Colonel,
IT IS A GROUND ISSUE! Whine usually comes from improper grounding. If you have all of your equipment going to one ground spot, it could cause a whine. I have mine grounded also under the backseat, yet in multpile areas.
If I remember correctly, my amp that powers my subs is grounded by the bolts on the drivers side of the backseat, while my interior amp is grounded on the passenger side.
I would check and see if that fixes the problem, if not then I would also look into getting a ground loop isolator and hooking it up to your radio.
It plugs into your radio where the RCAs currently are and then the RCAs plug into the isolator. It gets rid of MOST of the whine cause by the alternator.
-Smurf-
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"Check mate Bitch!"
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