Originally Posted by Technic
I would like to know your results in switch position #2 as well, as it does not make any sense to me that a different harness connector is sufficient to warrant an OEM HU coding change.
Something else must be going on here.
I will make more measuments when the kit arrive. I will post the results.
If the response with the switch set at position #2 is relatively flat, next I will probably replace the rear speakers by component speakers driven by the head-unit. Because the back speaker will not be equalized by the Alpine amplifier, I will most likely have to attenuate the high frequencies to the tweter by 3-4dB. I will see when I am there.