2008 GMC Sierra 1500 Pickup Owner's Manual - Page 219

Setting the Tone (Bass/Midrange/Treble) BASS/MID/TREB (Bass, Midrange, or Treble): To adjust bass, midrange, or treble, press the f knob until the tone control labels display. Continue pressing to highlight the desired label, or press the pushbutton positioned under the desired label. Turn the f knob clockwise or counterclockwise to adjust the highlighted setting. You can also adjust the highlighted setting by pressing either SEEK arrow, \FWD (forward), or sREV (reverse) button until the desired levels are obtained. If a station's frequency is weak or if there is static, decrease the treble. To quickly adjust bass, midrange, or treble to the middle position, press the pushbutton positioned under the BASS, MID, or TREB label for more than two seconds. A beep sounds and the level adjusts to the middle position. To quickly adjust all tone and speaker controls to the middle position, press the f knob for more than two seconds. EQ (Equalization): Press to change Digital Signal Processing (DSP) settings (Bose® audio systems only). DSP settings provide a choice of different listening experiences. The following DSP settings are available: • Normal - Select this setting to adjust the audio for normal mode. This provides the best sound quality for all seating positions. • Driver - Select this setting to adjust the audio for the driver to receive the best possible sound quality. • Rear - Select this setting to adjust the audio for the rear seat passengers to receive the best possible sound quality. • Surround (Centerpoint®) - Select this setting to enable Bose Centerpoint®. Centerpoint® signal processing produces a surround sound listening experience from a CD or XM™ stereo digital audio source. Centerpoint® delivers five independent audio channels from conventional two channel stereo recordings. (Not available for AM, FM.) 3-83