Erik wrote: " I share this with all of you just as an example of the work that goes into making a loudspeaker from parts, and the tools, and how much of what we hear has to do with choices made in the crossover. "
Your post and that article are a welcome respite from repeated accusations by one person on this forum of being a scammer because I’m a loudspeaker designer. Thank you Erik.
"... the goal is not merely quality assurance, but to build a complete electro acoustical understanding of the system as a whole so changes can be considered, and their final results predicted."
Imo a complete acoustic understanding would include a great deal more off-axis data. This is just my opinion.
" This particular article does just that, and comes up with a couple of suggestions for re-working the crossover to end up with hopefully a better end result. "
I agree with the direction of all of the changes the author made. I probably would have reduced the output of the tweeter in the crossover region even more that he did, to partially offset its excess off-axis energy at the bottom end of its passband.