2006 GMC Envoy Owner's Manual - Page 257

Setting the Tone (Bass/Midrange/Treble) AUDIO: Push and release the AUDIO knob until BASS, MID (without Bose®), or TREB appears on the display. Turn the knob to increase or to decrease. The display will show the bass, midrange (without Bose®), or treble level. If a station is weak or noisy, decrease the treble. To adjust the bass, midrange (without Bose®), or treble to the middle position while it is displayed, 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. The radio will save separate AUTO EQ settings for each preset and source. If the radio is equipped with the Bose® audio system, the equalization settings are either CUSTOM or TALK. 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 or fade to the middle position while it is displayed, 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. 3-113