I have used 3 different cassette adapters and still the sound presists. I do have an amp in the car but i doubt it has anything to do with that coz when i play cds there is no such sounds. Even when the ipod is disconnected the whine remains, when i pause the ipod and go into higher rpms it gets really loud but once i play the ipod the music overlaps the whine but the whine still can be heard in the background.I havent ever played a normal tape... i will do the same and let u know but i dont think the whine comes with a normal tape.
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