1st Gear Member
Join Date: Jun 2004
Location: Sweden - Stockholm
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Had the same problem with mine...i had a couple of audiobahn 12cm's
The whining noise is never becouse of the speakers(if you havent done some seriously bad wiring, which I dont think).
Most good amps have a filter that takes away the engine noise and all fluctuations in the hull. Sometimes this filter can be faulty...so if your amp is supposed to have it i would try to get it changed for a new one at the shop you bought it.
Or if you want to make it simple you just go down to the nearest car-audio shop and get yourself an RCA filter which should remove the whistling sound.
Remember that these fitler usually are only for a pair of RCA cables so if you got 4 RCA inputs you neede two filters..
Black E39 530i 2001 with full black leather interior and antracit roof.