I’ve become somewhat sceptical to all these special solutions in audio that tend to pop up , they are at best a one trick pony, or the “problem” they solve really are not what they think . Seems to me the myth that you can’t have crossovers in the midrange comes from doing it badly in the past not understanding the full dispersion of the speaker in all directions… ? Now we do and it’s not a huge problem at-least not such a huge problem that introducing even worse problems are a valid solution . 
Audio seems to have been a bit exploratory in the past many paths where tried , but as for now more refined traditional transducers waveguides or coaxes and measurements aided xover design seem to make more progress.
Audio seems to have been a bit exploratory in the past many paths where tried , but as for now more refined traditional transducers waveguides or coaxes and measurements aided xover design seem to make more progress.