Is the most efficient speaker the best speaker?

1) I disagree about horns efficient = more dynamic based on actually hearing them. Yes, they can play LOUDER as they are more efficient but as for actual dynamic contrast (difference between musical peaks) ATC active 100's were far more dynamic and more punch.

2) I use relatively inefficient drivers but have NO crossover to absorb power. So there is more to it than just driver efficiency. Take a look at how much power Thiel, with their elaborate 1st order x-overs, need.

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)