JM was a pretty accomplished guy technically when it came to speakers. at the time beam blockers/bras set off quite a firestorm, i was using turbosound powered PA speakers with dual concentric tweeter & mid-low frequency drivers in our outdoor amphitheater to address the phase cancellation from offset arrival times normal to traditional 3-way PA boxes.
Jay and i engaged in forum chatter about the benefits of the tweeter in the dual concentric system minimizing phase error by reducing the depth of the cone/source thus eliminating the highs from radiating and reflecting at multiple points off the cone which the beam blocker was actually correcting, not just diffusing/attenuating a laser-like beam of highs—
and further phase error correction gained by aligning the tweeter and mid/woofer on the same axis versus conventional tweeter horn up top/mid and low drivers below in a line.
later i believe Jay ended up using that dual concentric design for the 1st gen Atomic CLR FRFR speakers he helped develop if i’m not mistaken?
Egnater folks maybe used the tone bras as i remember Frank Lamar mentioning the merits of them? @Jeff Hilligan would remember…