Academic question for the Bose guys:
I was very skeptical about the claim that the volume from a PAS drops off much more slowly than it does from a conventional loudspeaker, because basic physics tells us that sound intensity diminishes according to the inverse square law.
But having heard it with my own ears, I can attest to the fact that indeed, the sound intensity over distance decreases much more slowly with the PAS than it does with a conventional loudspeaker.
So I'm missing something here. I thought that was physically impossible.
Does this have to do with the fact that the PAS is a line array and not a point source? In other words (let me see if I can articulate this correctly...) the sound energy at any given distance is spread uniformly (?) over a wave front, which with a conventional speaker is spherical, but with a line array is cylindrical. A sphere of a given radius has more surface area than a cylinder (I think) so the same amount of sound energy at a given distance is spread over a greater area, which means it will have a lower sound pressure level at that distance.
Is this close to the reason why?