Like other cars in its class, the Lexus LS 460L is a rolling isolation chamber that can be filled with rich sound from the available Mark Levinson audio system. Aside from engine growl when the driver plants the accelerator to the floor, nothing gets in to disturb occupants. The world is muffled and distant, the suspension gliding over any kind of road surface as though every street and highway just got a fresh coat of smooth blacktop.