2006 GMC Envoy Owner's Manual - Page 243

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 control is displayed. ALL CENTERED will appear on the display, you will hear a beep, and the display level will be adjusted to the middle position. AUTO EQ (Automatic Equalization): Press this button to select customized equalization settings designed for country/western, jazz, talk, pop, rock, and classical. Selecting CUSTOM or changing manual tone controls, returns the EQ to the manual tone control. 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 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 or fade to the middle position while it is displayed, push the AUDIO knob and hold it until the radio produces one beep. The balance or fade will be adjusted 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 control is displayed. ALL CENTERED will appear on the display, you will hear a beep, and the display level will be adjusted to the middle position. 3-99