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Check your connections. When I had an OEM amp converter (dont really remember, just remember crutchfield said i needed it, small black box in between the head unit and the stock amp) for my head unit it would whine until i hit it with my foot to shift the connections. It may be internal so it would be hard to find. Easiest way to find out is buy a head unit form walmart, install it, and if the whine is gone thats your problem, if not just return it.
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