hey i have a 98 323is with the harman kardon sytem in it, im trying to change the head unit. what wire turns on the amplifier and, do you supply 12v or draw 12 v in order to do so? Because there is an aftermarket harness available, I am sort of assuming the input to the HK are speaker level, not high impedance input. Am I correct in that assumption?
ANy help is appreciated, thanks.