Horns: Why don't they image well?

Partly correct, but for many years horn systems have included "phase plugs" or their equivalent to keep horns from "beaming" high frequencies. The high end horn systems I use for pro sound are designed to spread high frequencies over a large area, and they do that well, and the Klipsch Heresy IIIs I use in my home system easily have as good or better dispersion of high frequencies than the dynamic speakers I've owned over the years. 

I'm not sure what acoustic advantage a loft with 16 foot ceilings would provide, unless you got to keep some rugs, wall hangings, and soft furniture after the divorce.

Nothing quite like Heresys in a large warehouse...however, with Heresy IIIs 9 feet from my head the imaging is astonishingly good. Come on over and hear 'em George (see, I know he's in Australia and unlikely to find me here near Boston, still...).

Wait...can we get back to my pizza question? I get frustrated when questions are ignored...

Would that be a pizza thread or a tire thread?

Pizzas...why don't they work as spare tires?