Buick 2002 Century - Manual (Page 156)

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Setting the Tone (Bass/Treble)
BASS: Press this knob lightly so it extends.
Turn the knob to increase or decrease bass.
TREB (Treble): Press this knob lightly so it extends.
Turn the knob to increase or decrease treble. If a station
is weak or noisy, you may want to decrease the treble.
Push these knobs back into their stored positions when
you’re not using them.
Adjusting the Speakers (Balance/Fade)
BAL (Balance): Turn the control behind the upper
knob to move the sound to the left or right speakers.
The middle position balances the sound between
the speakers.
FADE: Turn the control behind the lower knob
to move the sound to the front or rear speakers.
The middle position balances the sound between
the speakers.
AM-FM Stereo with Cassette Tape Player
(If Equipped)
Playing the Radio
ON/OFF: Press this knob to turn the system on and off.
VOLUME: Turn the knob clockwise to increase
volume. Turn it counterclockwise to decrease volume.