Indeed. Another advanced implementation of the concept (other than Danley unity/synergy horns and other diffraction-based solutions like the Seas DXT) is Keele'

Indeed. Another advanced implementation of the concept (other than Danley unity/synergy horns and other diffraction-based solutions like the Seas DXT) is Keele's C(constant) B(eamwidth) T(ransducer): https://www.xlrtechs.com/dbkeele.com/CBT.php https://www.xlrtechs.com/dbkeele.com/CBT.php https://www.xlrtechs.com/dbkeele.com/images/Card%20Back%20Large.png https://www.xlrtechs.com/dbkeele.com/images/Card%20Back%20La... https://www.audiosciencereview.com/forum/index.php?threads/constant-beamwidth-transducer-cbt-speakers.12060/ https://www.audiosciencereview.com/forum/index.php?threads/c...