Buick 1993 Century Owner's Manual page 120

AM/F"
Stereo Radio
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The digital display indicates information on time or radio
station frequency,
the
AM or FM radio band, whether
the station is in stereo, and other radio functions.
PWR (Power): Press
to turn the radio on and off when
the ignition is on.
Upper Knob (VOL): This knob'does two things:
Rotate it to control the volume.
When the ignition is off, press the knob to display the
time.
BAL
@dance): The control
ring
behind the upper knob
adjusts the lewright speaker balance.
Lower Knob
(TUNE): This knob does two things:
Rotate it to tune in radio stations.
Press it to change between the AM and
FM
bands.
FADE:
The control ring behind the lower knob adjusts
the front/rear speaker balance.
TREBLE: Slide this lever up to increase treble, or down
to decrease it.
If a
station is weak or noisy, reduce the
treble.
BASS: Slide this lever up to increase bass, or down to
decrease it.