Hello all. The garage where I recently bought my Z3 have fitted my Sony radio/cd that I had from a previous car. The fade function, ie, balance between front and rear speakers does not seem to work, which means that only the front speakers produce sound. They did mention something about blown amps and incompatability but frankly it was a bit over my head! Do I assume that there is an amplifier somewhere in the vehicle which is inoperative and would replacing this bring the rear speakers into operation. The rear console between the seats is not a storage compartment. Would an amp be in there? Thanks for advice. J.K.