Horns: Why don't they image well?

Erik’s thread is entitled, "Why don’t horns image well?", and the entire text of his opening post is, "Anyone have a theory?".

In asking for theories, it seemed like Erik was inviting "tech details" as well as how they "relate to actual perceived sound".

I do think both are useful and fun, but we should be careful about being sure when we join one to the other. 

Best, 

E

Horns require large space and proper placement. My tractrix horns image well enough that I get compliments on my (nonexistent) center channel.

I have Heresy IIIs - a fairly cheap speaker as horns go - and they image better than some 2-way monitors I've had in house. They only require a bit more distance to do so.

Extremely wide dispersion