GMC Denali 2004 Owner's Manual page 200

Setting the Tone (Bass/Treble)
AUDIO: Push and release the AUDIO knob until BASS
or TREB appears on the display. Turn the knob to
increase or to decrease. The display will show the bass
or treble level. If a station is weak or noisy, you may
want to decrease the treble.
To adjust the bass and treble to the middle position,
push and hold the AUDIO knob. The radio will produce
one beep and adjust the display level to the middle
position.
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 will appear on
the display, you will hear a beep and the display level
will be adjusted to the middle position.
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.
Your 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.
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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 and fade to the middle position,
push the AUDIO knob then push it again and hold it until
the radio produces one beep. The balance and fade
will be adjusted to the middle position and the display
will show the speaker balance.