For the OP, do you know if any non-music sound info (like navigation, phone calls, PDC, etc), comes from the center channel? Assuming you have not changed any of the input/output signal routing from the default Audiotec tune file, you can find out by merely turning off (or muting) the center channel in the tune file.
This info would be good to know for others who may want to use the UP10DSP in HK/RAM equipped vehicles. It would mean that the MEC Analog In add-on board is not really required. I have not verified the actual pins on the harness, but I believe the only reason the MEC Analog In is needed is to get the center speaker output from the RAM. However, the DSP FX software can create a center channel output (better than factory IMHO) with the left and right signals, so the factory center channel signal is not needed.
An added bonus is that it will save ~$150 or so as the MEC Analog In is usually sold separately. Of course, a reason to keep it would be integration of aftermarket audio devices like a radar detector. I integrated my radar detector sound (a Valentine 1) using one of the unused speaker level inputs in my UP10DSP in my M3 - so now my V1 can be heard from the car’s speakers (the MEC Analog in is not needed in my application, though). Just one example of the flexibility/integration that this amp is capable of….
