GMC 2009 Sierra - 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 s REV (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.)
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