Anybody know if there's a sub gain adjustment on the amp in the Mark Levinson sound system.. how you get to it, etc? The system is light on bass and there's got to be a way to adjust.

 

The bass is perfect until u receive the first phone call by car play and then will drop, all what u can do, switch the system off and then on, the bass level will go back to its normal level
i believe that needs an update