Just something I think we should clear up when applying generalizations like “frequencies below 80 Hz are non-directional” which like many generalizations is over simplified... However, I submit that most people posting in or even lurking around forums like this want to know more about and get something more out their system than just the average person.
Then one should talk about the Schrodinger/Schroer (or whatever it is) point. That being the point at which sound waves change from behaving like a wave to behaving more like a ray. That can be between 150 and 300Hz (room dependant). The point being that it is at this point that sound waves become more easy to localize. Hope I didn't mangle that too much, I can't find my original reference.
