GMC Sierra Denali Classic 2007, Owner'S Manual, Page: 213 / 502

AUTO EQ (Automatic Equalization): Press this
button to enhance the audio performance for
different passengers in the vehicle.
The setting last chosen will appear on the display
when you first press AUTO EQ. Each time you
press this button, another setting will appear on the
display and AUTO EQ will switch to one of the
preset settings listed.
The audio system allows you to choose from
four different equalization settings: normal, driver,
rear and spacious. These settings can be used
while listening to the radio, cassette or the
CD player.
NORMAL: This setting provides the best overall
vehicle sound quality for all seating locations.
DRIVER: This setting gives the driver the
best sound quality.
REAR: This setting gives the rear seat
passengers the best sound quality.
SPACIOUS: This setting makes the listening
space seem larger.
The radio can save separate AUTO EQ settings
for each preset and source.
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.
Turn the knob to move the sound toward the right
or the left speakers.
To adjust the fade between the front and the rear
speakers, push and release the AUDIO knob
until FADE appears on the display. Turn the knob
to move the sound toward the front or the rear
speakers.
To adjust the balance or fade to the middle
position while it is displayed, push the AUDIO
knob, then push it again and hold it until the radio
produces one beep. The balance or fade will
be adjusted to the middle position and the display
will show the speaker balance.
To adjust all tone and speaker controls to the
middle position, push and hold the AUDIO knob
when no tone or speaker control is displayed. ALL
CENTERED will appear on the display, you will
hear a beep, and the display level will be adjusted
to the middle position.
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