Hummer 2003 H2 Owner's Manual page 205

AUTO EQ (Automatic Equalization): Press this
button to choose equalization settings.
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, the cassette tape, or the CD player.
NORMAL: This setting enhances the stereo effect.
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 will save separate AUTO EQ settings for each
preset and source.
Adjusting the Speakers (Balance/Fade)
AUDIO: To adjust the balance to 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 to 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.
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. The radio will produce
one beep and display ALL with the level display in the
middle position.
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