See also:

USB audio interface/audio interface for mobile phone
OverviewIt is possible to connect external audio devices. They can be operated via iDrive. Sound is output over the vehicle speakers. Options for connecting external devices > Connection via US ...

Connecting electrical devices
Note Do not plug the charger into the socket Do not connect battery chargers to the factory-installed sockets in the vehicle. Doing so may result in damage to the vehicle.◄ Sockets Socket ...

Tone
Only treble and bass can be set in the rear for headphones. The settings are made separately for the left and right headphones. Operation is the same as for the front tone. ...