Funny, being casually interested in horn speakers for some time, I have been casually intrigued by this thread for some time also without actually taking the time to read it until today when I looked at the some of the posts in this last page. I then read:
****Harry Pearson has done a greater disservice to high end audio than anyone else I can think of. His faulty proclamations, pretentious stance, and cronyism misdirected about 2 decades worth of audio growth. The internet came to the rescue when we finally started talking amongst ourselves thereby learning the myth in his message.****
Man, talk about living on a different audio planet from mine! I am still intrigued by horns (a little), but one thing is certain: I am looking (listening) for different things in audio than the author of that comment. Perhaps that is a part of the answer to the OP's original question.