Lexus 2014 LX570 Owner's Manual page 569

"DSP" tab
After sound setting has been changed, touch "OK".
The sound quality level is adjusted individually
■
The treble, mid and bass levels can be adjusted for the each audio mode separately.
About Automatic Sound Levelizer (ASL)
■
ASL automatically adjusts the volume and tone quality according to the vehicle
speed, wind noise or other noise.
LX570_OM_OM60L21U_(U)
3-3. Using the audio system
Automatic Sound Levelizer
(ASL) on/off
Surround on/off
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