It may well be that controlled directivity speakers are best practice. As I've said before, I have a design project that involves this approach, but it's being held hostage to a woofer delivery by a notoriously late provider of great woofers.
Gee, I
wonder who that could be!
Where I part company form you is your automatic assumption that the ear weights all of those off-axis response curves equally. I just don't think that's a valid assumption.
We don't in fact part company there, because I never made that assumption, automatic or otherwise. Furthermore, I know it's not true.
My only assumption (not so much "assumption" as "established fact") is that we don't just hear the direct field (i.e. design-axis response) but also the reverberant field.
From that foundation, my premise is nothing broader than the following:
"when the reverberant field is markedly different in its spectral content in the midrange, that colors the overall sound."
There are ways around that, such as lots of room treatments. I could never live with (or in) a heavily-treated room, but for others crappy speakers and lots of eyesore room treatments could be a valid path to high-fidelity reproduction.
I've played in orchestras for 50 years, and I've heard some of the best speakers available, including some controlled directivity models. What I hear coming out of my designs is basically what I hear when I'm in an orchestra hall.
Your scope shift there doesn't do you any favors, Dr. Murphy.
"I've
played in orchestras for 50 years,"
"What I hear coming out of my designs is basically what I hear when I'm
in an orchestra hall."
"Of course, it's possible that all of the halls I've
played***"
(emph. added)
For the first and third phrases to have any meaningful relationship to the second phrase, one would have to assume that speakers are supposed to sound like what musicians hear on stage. Generally, that is false, because speakers are designed to reproduce recordings, which are typically designed to can what the
audience would hear, not what the
musicians would hear. Only the second of your three phrases could be construed as relating to that experience.
You're play violin or viola, right? You know, it IS entirely possible that your experience of sitting in an orchestra pit HAS conditioned you to expect more midrange energy from reproduction than would be heard by the audience.
So, in a perhaps counterintuitive sort of way, 50 years of
playing in orchestras is a whole lot less meaningful a credential than 50 years of
subscribing to an orchestra. Though I do presume you've attended plenty of concerts as well. Probably more than I have, given that you're likely more than double my age.
Of course, it's possible that all of the halls I've played in have ..."a mushroom cloud of midrange energy from ~ 1-5 kHz." Could be.
Please note that I made that comment about the Sierra Tower Bamboo Loudspeaker, and that comment is clearly accurate based on the manufacturer-provided measurements. Though I am assuming that speaker wasn't your design. Perhaps it was.
About the speakers you sell under your own line, i.e. Philharmonic Audio, I noted that you seemed to have made directivity matching between midrange and tweeter a fairly high priority, given that you have (a) a fairly narrow midrange, and (b) a rather low mid-tweet crossover.