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Took the car in to the shop today This is what they found at the input to the sub amp (output from the BMW head units):
OEM Phillips Business Cassette: 0v DC offset at idle, 3v DC offset at full power.
OEM Alpine Business CD: 3.5v DC offset at idle, 6.5v DC offset at full power.
Their diagnosis was probably a problem in the output stages of the CD head unit. Remember, though, both head units are working fine with the BMW amp - just the sub amp that's a problem.
Any other possibilites? Would this cause the problems I'm seing with the CD head unit and not the cassette?
Thanks
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