Hummer 2006 H3 Owner's Manual page 184

Setting the Tone (Bass/Treble)
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(Bass/Treble): Push and release this knob until
BAS or TRE appears on the display. Turn this knob to
increase or to decrease. The display will show the
bass or the treble level. If a station is weak or noisy,
decrease the treble.
To adjust the bass and the treble to the middle position,
push and hold the tone knob. The radio will produce
one beep.
To adjust all tone and speaker controls to the middle
position, push and hold the tone knob when no tone or
speaker control is displayed. CEN will appear on the
display and you will hear a beep.
AUTO EQ (Automatic Equalization): Press this button
to select customized equalization settings designed
for country/western, jazz, talk, pop, rock, and classical.
To return the bass and treble to the manual mode,
push and release the tone knob until MANUAL appears
on the display.
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Adjusting the Speakers (Balance/Fade)
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(Balance/Fade): To adjust the balance between
the right and the left speakers, push and release
this 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 speaker knob until FAD
appears on the display. Turn the knob to move the
sound toward the front or the rear speakers.
To adjust the balance and the fade to the middle
position, push the speaker knob, then push it again and
hold it until you hear one beep.
To adjust all tone and speaker controls to the middle
position, push and hold the speaker knob when no tone
or speaker control is displayed. CEN will appear on
the display and you will hear a beep.