Mercedes-Benz 2005 SLK-Class Operator's Manual page 196

Controls in detail
Audio system
Adjusting treble
Press O button repeatedly until
TREBLE appears in the display.
Press or soft key to increase or
+ –
decrease tone level accordingly.
or
Press RES soft key briefly to reset treble
tones to their center level.
The radio switches back to the
standard radio menu eight seconds
after the last soft key is pressed.
196
Returning sound functions to factory
settings
Press O button to call up settings
menu in the display.
Press soft key briefly; the respec-
RES
tive sound function is reset to its center
level.
or
Press and hold soft key until
RES
appears in the display.
The sound settings for bass and treble
are returned to their center level and
the volume is set to a predefined level.
The radio switches back to the
standard radio menu four seconds
after the last soft key is pressed.
Adjusting balance
Press P button.
BALANCE appears in the display.
Press X or Y soft key.
The volume is distributed between the
left and right sides of the vehicle.
or
Press soft key briefly.
RES
RESET
The balance is reset to its center level.
The radio switches back to the
standard radio menu eight seconds
after the last button is pressed.