Join Date: Jul 2017
Location: In my Alfa
County: Overijssel, Netherlands
The CAN bus is nowhere near fast enough to put bitstream audio through. Also it would be a waste of bandwith and audio quality to even try.
I am very curious where the signal gets translated from analog to "digital". If there is just an analog signal arriving at the B&M unit, it shouldn't be an issue to re-route it.
You would however also need to measure the impedance of the microphone and see if your new headunit has the appropriate amplifier.
Maybe some B&M pinouts will help.
Did you check E-Learn for wiring info on the B&M and/or radio nav routing?
I can check when I'm home tonight. Sounds like an interesting undertaking and I think it can be done!