2011 Lexus IS 350 Navigation Manual - Page 168

AUDIO/VIDEO SYSTEM (d) DSP control 1. Push the "AUDIO" button. 2. Touch "Sound". (e) Tone and balance Tone How good an audio program sounds to you is largely determined by the mix of the treble, mid and bass levels. In fact, different kinds of music and vocal programs usually sound better with different mixes of treble, mid and bass. Balance A good balance of the left and right stereo channels and of the front and rear sound levels is also important. Keep in mind that if you are listening to a stereo recording or broadcast, changing the right/left balance will increase the volume of one group of sounds while decreasing the volume of another. 3. Touch "DSP" tab to display this screen. 4. Touch the desired button. Surround function (if equipped): Touch "On" of "Surround" and touch "OK". The surround function will turn on. Automatic sound levelizer (ASL): When the audio sound becomes difficult to hear due to road noise, wind noise or other noises while driving, touch "On". The system adjusts to the optimum volume and tone quality according to the speed of car, wind noise or other noise. 192