Actually, in most rooms a 30" wide baffle is the point where a T/S max flat is 'flat enough' when well away from the walls and why I prefer them, so usually have to be rolled off if near one. Neither will probably work 'best' as is, but mine is a bit more tunable unless you convert the other's slot port to an adjustable vent.
Yeah, the B20 got a lot of 'air play' for awhile and I posted about my crude OB experiments with a B20 and its woofer variant (-54F), with a small square piezo horn nestled in the lee of the two. Pretty impressive, all things considered, but never got a chance to fine tune it or work it into a pipe design. Then recently I shifted to my still-born B20 BIB/tapped horn Monolith with these drivers. I'm starting to wonder if the foam's going to rot before I get to build something with them.
Interesting! What movie is the video from?
FWIW, here's one B20 tapped horn I simmed:
GM