From a 2007 manual: AUTOMATIC SOUND LEVELIZER (ASL) (Type 1 and Type 2 only) When the audio sound becomes difficult to be heard due to road noise, wind noise, etc. during driving, the system adjusts to the optimum volume and tone quality ac- cording to the noise level. Vehicles with compact disc changer: Touch the “ASL” switch. When the system is on, the sound adjust- ment level is displayed on the screen. Vehicles without compact disc changer: Touch the “DSP” switch to display the “ASL” screen. Touch “High”, “Mid” or “Low” and then “OK”. When you touch “High”, you can obtain higher sensitivity of the sound levelizer. When you touch “Low”, the sensitivity will be lowered. Touching “Off” turns the system off. I've used the sound levelizer in my 2013 Prius 2, and I can't tell if this feature is working. I have to adjust the sound system when the road noise increases and decrease it when coming to a stop. It doesn't seem to make much difference what setting it is on. I have it set to "High" now. Anyone else have this issue?
There have been many threads on this subject if you want to search. The general thought was that it did not work very well.
We bought a 2013 Prius Three recently, and after experimenting with the auto levelizer, I cannot tell any difference no matter what setting I use, or even leaving it off. I always have to fiddle with the volume as I drive. My '99 Audi A4 had a similar control which worked really well, so this fake feature on the Prius is doubly annoying. patrick
I also cannot tell if it does anything so turned it off. I figure the less processing of the audio, the cleaner the sound.
my 2010 prius sound system quit ,wont work I have blue logic I can play Iheart though my phone but no radio even change it didn't work Help Please
