There's probably a Nobel waiting for someone to show the inverse square law doesn't apply to sound from any source.
@dogberry In a line source when you are close to the speaker the sound you are hearing is coming from right in front of you. As you move further back, more of the driver(s) sound is able to reach your ears, so the sound pressure appears to not fall off as quickly. In fact its seems almost constant, but if you got far enough away (not possible in most rooms) you'd find that is obeying the inverse square law.
Years ago I built an OTL guitar amp that employed four 8" drivers snuggled as close together as possible in a vertical line. This was meant so that the musician wouldn't have to play seemingly quite so loud for the amp to project nicely and it worked quite well for that- you could hear the amp as easily at the front of the stage as you could in the rear of the club.