2006 GMC Envoy Owner's Manual - Page 227

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 the treble level. If a station is weak or noisy, decrease the treble. To adjust the bass, midrange (without Bose®), or the treble to the middle position while it is displayed, push and hold the AUDIO knob. The radio will produce one 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. 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 the bass and treble to the manual mode, push and release the AUTO EQ button until CUSTOM appears on the display. 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 the fade to the middle position while it is displayed, push the AUDIO 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 AUDIO knob when no tone or speaker control is displayed. ALL CENTERED will appear on the display and you will hear a beep. 3-83