Horn based loudspeakers why the controversy?

Except music with a 5 string bass at 31hz for the low B, percussion overtones, pianos, the ambient sound around live orchestras, life...etc....

Not to mention the 16Hz tone of the lowest pipe organ pedal! Some of the other lower pedals also create sub-40Hz tones, as does, as wolf said, the far left end of the grand piano keyboard. Recordings made in large venues (cathedrals, churches, large theaters) often contain sub-40Hz room sound.

https://www.facebook.com/groups/614272918584739/   Doing more designing collecting modifying and restorations not manufactering product anymore so on FB and social media. I owned 2 pairs of AG horns built about a doz bass systems for trio owners. AG are OK horns but integration with bass is a issue but its also a issue for many horns since midbass on down is usually compromised in size or not  horn loaded. If mid bass and bass are proper horns they yield some of the best mid bass and bass availble but as I mentioned above its were product gets compromised  DIY types are free to build proper sized but they are not easily availble maybe this is part of the issue hardly anyone has heard or owned full range all horn loaded systems and they take knowledge and  sometimes real physical work to set up. And face it most just want to easily buy just open box and plug in. But with many things in life sometimes whats easy and convenient is not whats best.

Apparently the XD series has solved a lot of bass integration issues... you guys know anything about that