Originally Posted by
mmandley
I think the fancy term is attenuate the Horn Driver.
In reality what it sounds like is the horn doesn't start projecting for a few feet.
With the Switch on +3 <if i recall> and on a tower that is over the center of the cabin or the windshield like mine is, then the Horn is full power by the back seat, and the people in the back seat are getting blasted with the horn.
On -3 <if i recall> the horn is much tamer and seems to get really loud once its past the rear seats. This allows it to not over power your cabin as much and yet still project to your riders.
I know this isn't as technical as MLA or AudoDave but this is my best real world explanation LOL.