Originally Posted by Technic
The only microphone adjustment in this particular OEM DIRAC system was done at development, according to BMW. There is no active microphone adjustment in this system, only speed- and bass-equalizations.
One feature that really changes the audio response of this system is the speed-adjustment (GAL). Anything above 1-square will change the EQ curve that you set above 40mph or so.
This GAL implementation is the most aggressive that I have seen in all BMW systems.
There is no MIC in the car for DIRAC to be constantly adjusting. It was done at development, and it is now fixed.