Pontiac 2004 GTO - Manual (Page 148)

Speed Dependent Volume (SDV)
With SDV, your audio system adjusts automatically to
make up for road or wind noise as you drive.
This feature will never completely compensate for
driving noise. There are other factors such as road
surface, wind noise, windows open, and engine speed
that may alter the interior noise for any given road
speed.
You can select compensation rates between 0 (off) and
5 (maximum compensation) in the options menu.
See “Options Menu Adjustment” later in this section to
adjust SDV.
Dynamic Distortion Limiting (DDL)
Your radio has a feature that limits the amount of
amplifier distortion that you can hear. When this feature
is turned on, it continuously monitors the quality of
the signal to the speakers. When the signal distortion
exceeds the preset limits the radio will automatically limit
or reduce the volume until the distortion is minimized.
Under some circumstances, distortion may be heard for
a very short period of time until the system has taken
the necessary steps to limit it.
The main source of distortion in music is the low
frequency bass caused by drums or large instruments.
Music that features very strong bass may trigger the
distortion limiting system and the system will then
reduce the volume to minimize the distortion.
Increasing the bass control or the EQ boost may also
result in a reduced volume level due to the emphasized
bass. See “Setting the Tone (Bass/Treble)” previously
in this section. The DDL can be turned off so that
the radio will deliver a higher volume level, but distortion
will also be increased.
See “Options Menu Adjustment” later in this section to
adjust DDL.
Options Menu Adjustment
Confirmation beeps, SDV, and DDL can all be adjusted
by doing the following:
1. Turn off the radio by pressing the OFF button.
2. Press the ON button and pushbutton 1 at the same
time until Options Menu appears on the display.
3. Push the AUDIO knob until the correct option
appears on the display.
4. Turn the AUDIO knob to adjust the setting of the
option being displayed.
5. Push the AUDIO knob to select another option or
press the OFF button to exit the options menu.
Your selection will be saved.
If no buttons are pressed or turned for eight
seconds, the radio will automatically exit the menu
and the radio will turn on.
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