By the way when wesayso and ra7 get to the point to build five more arrays

SBA have annouced prototype datasheet REV.0 for their planned high Qts lets say TC9 clone in its also a sqare frame at 77,4mm with a about 61mm piston so you can stack a few more inside same lenght compared to TC9.
After asking kimmosto over at VituixCAD thread for feature to translate txt/frd files to IR he lately guided me his software can do it within a few steps (LINK:
https://www.diyaudio.com/forums/software-tools/307910-vituixcad-68.html#post5584200 ) so those below IR graphs into REW should not be so far from curves in SBA datasheet, but okay the directivity graphs from VituixCAD is a bit too hot into low frq area because i was too lazy and fast to get them to see using one more baffle upon the baffle that probably is used into datasheet.