2005 Pontiac Aztek Owner's Manual - Page 209

Setting the Tone (Bass/Treble) AUDIO: Push the AUDIO knob until BASS, MID, or TREB appears on the display. Turn the knob to increase or to decrease. If a station is weak or noisy, decrease the treble. To adjust bass, midrange, or treble to the middle position, select BASS, MID, or TREB and push and hold the AUDIO knob. The display level will be adjusted to the middle position and you will hear a beep. 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. CENTERED will appear on the display and you will hear one beep. AUTO EQ (Automatic Equalization): Press this button to select customized equalization settings designed for country, jazz, talk, pop, rock, and classical. To return to the manual mode, press the AUTO EQ button until CUSTOM appears on the display. Then manually adjust the bass, midrange, and treble using the AUDIO knob. Adjusting the Speakers (Balance/Fade) AUDIO: To adjust the balance between the right and the left speakers, push 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 rear speakers, push and hold the AUDIO 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, select balance or fade and push and hold the AUDIO knob. The display level will be adjusted to the middle position and you will hear a beep. To adjust all tone and speaker controls to the middle position, push and hold the AUDIO knob when no tone or speaker controls are displayed. CENTERED will appear on the display and you will hear one beep. 3-87