2006 Lexus GS 300 Owners Manual - Page 934

AUDIO (c) DSP control Positioning selector: By selecting the listening position, the system controls the output timing of the speakers to allow sound to be heard evenly, creating the ideal music environment. Touching "CHANGE" the position switches in the following order; all seats, driver's seat, front seats and rear seats. G22008 The POSITION currently selected is displayed on the screen. To display the DSP control mode, touch the "DSP" switch displayed on the audio control mode screen. You can turn on/off the automatic sound levelizer, or select the position on the DSP screen. Automatic sound levelizer (ASL): When the audio sound becomes difficult to be heard due to road noise, wind noise, etc. during driving, touch the "ASL" switch. The system adjusts to the optimum volume and tone quality according to the noise level. When the system is on, the sound adjustment level is displayed on the screen. 288