Is the most efficient speaker the best speaker?

I don't understand how a 4" driver, even if has high efficiency due to horn loading, can move enough air to have much dynamics. A 12" driver has TEN times to surface area, not to mention much, much higher Xmax.

(Forgive me but I have not read every post in detail)

"I don't understand how a 4" driver, even if has high efficiency due to horn loading, can move enough air to have much dynamics."

Its all relative and depend on room size but basically teh answer is it can't compete in an apples/apples test.

Unsound, even if you consider them deficient, what are the best sounding horns you have heard?

The best I have heard are custom GoTo horns. I did not get to hear them over an extended period of time, but what I heard was quite good and with my eyes closed I do not think I could have guessed they were horns other than the fact that the dynamics were superlative.

Mapman, all thing considered, probably the Klipsch Forte.

Unsound, what was the rest of that system like?

I've head them in many, mostly modest systems, though not in some time. The reason I mentioned them was; they were inexpensive speakers, that didn't take up too much space, that could be driven by a cheap receiver, and still fill a large space with nearly full range music without completely embarrassing themselves. Very few others could do that, without costing significantly more (percentage wise). Not my cup of tea, but could work for some others with a large space, on a tight budget, that didn't want overly large boxes dominating the room, and not interested in too much fussing.