In a concert hall you generally do not sit very close to the group, and the sound wave is closer to a plane than a point source!
What is the point of point source?
I often read reviews of equipment that praise whatever is being reviewed for being a point source. I read this as a focused narrowly defined area that the music eminates from. I prefer the image of an "outside the speakers" soundstage that is often referred to. So why is point source a positive attribute?