2004 Pontiac GTO Owner's Manual - Page 148
2004 Pontiac GTO Manual
Page 148 highlights
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. 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. 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. 3-50