2005 Mercedes C-Class Owner's Manual - Page 190

Controls in detail Audio system Adjusting treble Press O button repeatedly until TREBLE appears in the display. Sound system* You can either program the sound settings manually ( page 187) or choose settings via preset sound characteristics. You can select from among the following settings: STANDARD: conventional stereo sound. SURROUND: the sound is set for better Press X or Y soft key repeatedly until the desired sound setting has been reached. The sound is set accordingly. or Press RES soft key briefly. The sound setting is reset depending on the sound source activated. Radio mode: STANDARD CD/AUX mode: SURROUND Telephone: SPEECH The radio switches back to the standard radio menu eight seconds after the last soft key is pressed. 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. three-dimensional acoustic characteristics. SPEECH: the sound is optimized for the spoken word. Press O button repeatedly until STANDARD, SURROUND or SPEECH appears in the display. 188