2003 Mercedes C-Class Owner's Manual - Page 169

Controls in detail Audio system Bass In radio, cassette and CD mode, press the AUD key repeatedly until BASS appears on the display. Treble In radio, cassette and CD mode, press the AUD key repeatedly until TREBLE appears on the display. Fader i Your vehicle may or may not have the fader function, depending on the vehicle equipment and model. In radio, cassette and CD mode, press the AUD key repeatedly until FADER appears on the display. Press the + or - key to increase or decrease the tone level accordingly. or Press both the + and - keys simultaneously to reset the bass tones to the center (flat) level. Press the + or - key to increase or decrease the tone level accordingly. or Press both the + and - keys simultaneously to reset the treble tones to their center (flat) level. Press the F or R key to shift the sound accordingly. or Press both the F and R keys simultaneously to reset the fader to its center level. 169