Buick 2004 Rendezvous Owner's Manual page 228

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, you may want to decrease the treble.
To adjust bass, midrange, or treble to the middle
position, select BASS, MID, or TREBLE. Then push and
hold AUDIO 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, end out of audio mode by
waiting five seconds without making any changes. Then
push and hold AUDIO 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
bass, midrange, and treble equalization settings.
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Adjusting the Speakers (Balance/Fade)
AUDIO: To adjust the balance between the right
and the left speakers, push and release AUDIO 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 AUDIO 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 AUDIO 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, end out of audio mode by
waiting five seconds without making any changes. Then
press and hold AUDIO for more than two seconds
until you hear a beep. ALL CENTERED will appear on
the display.