Buick 2005 Century Owner's Manual page 147

Setting the Tone (Bass/Treble)
AUDIO: Push and release this knob until BASS, MID,
or TREBLE appears on the display. Then turn the
AUDIO knob to increase or to decrease. If a station is
weak or noisy, decrease the treble.
To adjust bass, midrange, or treble to the middle
position, select BASS, MID, or TREBLE. Then push and
hold the AUDIO knob for more than two seconds until
you hear a beep. BASS and a zero, MID and a zero, or
TREBLE and a zero will appear on the display.
To adjust both tone controls and both speaker controls
to the middle position, first end out of audio mode
by waiting five seconds without making any changes.
Then push and hold the AUDIO knob for more than
two seconds until you hear a beep. ALL CENTERED will
appear on the display.
EQ (Equalizer): Press this button to select customized
equalization settings designed for country/western,
jazz, talk, pop, rock, and classical.
Adjusting the Speakers (Balance/Fade)
AUDIO: To adjust the balance between the right
and the left speakers, push and release the AUDIO
knob until BAL appears on the display. Then turn the
AUDIO knob to move the sound toward the right or
the left speakers. A bar graph with indicators will show
how the sound is balanced.
To adjust the fade between the front and the rear
speakers, push and release the AUDIO knob until FADE
appears on the display. Then turn the AUDIO knob to
move the sound toward the front or the rear speakers.
A bar graph with indicators will show how the sound
is balanced.
To adjust balance or fade to the middle position, select
BAL or FADE. Then push and hold the AUDIO knob
for more than two seconds until you hear a beep.
The indicator will be centered on the display.
To adjust both tone controls and both speaker controls
to the middle position, first end out of audio mode
by waiting five seconds without making any changes.
Then push and hold the AUDIO knob for more than
two seconds until you hear a beep. ALL CENTERED will
appear on the display.
3-47