GMC 2012 Sierra Series Owner's Manual page 221

Setting the Tone (Bass/
Midrange/Treble) (All Except
AM-FM Radio and Radio
with CD)
BASS/MID/TREB (Bass, Midrange,
or Treble): To adjust the bass,
midrange, or treble:
1. Press the knob until the tone
control tabs display.
2. Highlight the desired tone
control tab by doing one of the
following:
Press the knob.
Press the softkey under the
desired tab.
3. Adjust the setting by doing one
of the following:
Turn the knob clockwise
or counterclockwise.
Press the SEEK,
or SEEK.
\
Press the FWD,
s
or REV.
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 softkey positioned under
the BASS, MID, or TREB tab for
more than two seconds. A beep
sounds and the level adjusts to the
middle position.
I n f o r ma t i o n P r o v i d e d b y :
Infotainment System
To quickly adjust all tone and
speaker controls to the middle
position, press the knob for more
than two seconds until a beep
sounds.
EQ (Equalization): Press this
button to choose bass and treble
equalization settings designed for
different types of music. Selecting
MANUAL, or changing bass or
treble, returns the EQ to the manual
bass and treble settings.
Unique EQ settings can be saved
for each source.
®
If the radio has a Bose audio
system, the EQ settings are either
MANUAL or TALK.
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