Pontiac 2004 Bonneville Owner's Manual page 197

Setting the Tone (Bass/Treble)
TONE: Press and release this button until BASS, MID,
or TREB appears on the display. The SELECT LED
indicator will light to show that the tone control can be
adjusted. Turn the SELECT knob to increase or to
decrease. If a station is weak or noisy, you may want to
decrease the treble.
To adjust all of the tone controls to the middle position,
press and hold TONE until FLAT appears on the display.
EQ (Equalizer): Press this button to select customized
equalization settings.
You can set up to six customized equalization settings
by performing the following steps:
1. Turn the radio on.
2. Use the TONE button and the SELECT knob to
create the desired equalization.
3. Press and hold the EQ button for two seconds.
SELECT EQ # will appear on the display and the
EQ symbol will flash.
4. Press EQ or turn the SELECT knob to select the
desired EQ number.
5. Press and hold the EQ button or push the SELECT
knob to store the equalization setting and the
number. You will hear a beep and EQ SAVED will
appear on the display.
6. Repeat the steps for the other EQ settings and
numbers.
EQ 5 has been programmed at the factory for use with
talk radio, but it can be preset to a different tone.
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