Bose speaker
 

Hi can anyone help me I just bought a Bose rear speaker for my 51 plate boxster s it has a Porsche sat nav and phone PCM I cannot find out how to wire the Bose sub in , I called Porsche and they told me that unless the car was wired in the factory for the rear speaker then I cannot fit one they also said that the PCM needed to be programmed in the factory aswell for rear speakers and if it wasn't then my PCM will never power them or work , they also said that the car speaker wiring was fiber optic I am not sure if it is , I have the standard Porsche amp in the front of the car and the dash and door speakers and PCM can anyone help me and let me no if Porsche are talking rubbish as I have never heard of this before thanks simon