2005 GMC Savana Van Owner's Manual - Page 178

Setting the Tone (Bass/Treble) AUDIO: Push and release the AUDIO knob until BASS, MID, or TREB appears on the display. Turn the knob to increase or to decrease. The display will show the bass, midrange, or treble level. If a station is weak or noisy, decrease the treble. To adjust the bass, midrange, 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 controls are displayed. ALL CENTERED 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 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 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 rear speakers, push and release 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 fade 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 controls are displayed. ALL CENTERED will appear on the display and you will hear a beep. 3-64