After spending hours this past weekend tearing apart our 2003 Z4, my wife and I could only find the 3-pin connector bundled together with a coax cable. We had the trunk upholstery out and the speakers and center console out in the passenger compartment trying in vain to find the 6-pin connector. I think the coax cable is for connection to a cd-changer, but am not certain. In the mediabridge installation instructions, it mentions the need for accessories if a DSP amplifier is present. In our case, we have a DSP amplifier in the trunk adjacent to the battery. My question is, "does the coax cable bundled with the 3-pin connector run back to the DSP amplifier?" If so, life installing the DSP adaptor will be much simpler. If not, rat f@rts! Can anyone provide guidance on the installation? Thanks.