For large rooms with home theater spl requirements you should avoid all those little toys being mentioned left and right.
Forget small boxes with traditional drivers, active or passive doesn't matter.
They will compress or self-destruct in a large room with good acoustics long before you would want them too.
Whether you call them Kii, Genelec or something else isn't relevant, they're toys in this scenario. The mids and tweets are not up for the job, trust you me. Have ample experience with Kii - both with and without BXT - and can tell you they don't stand up to the task at hand for serious sound quality at loud volumes.
JBL M2 is mentioned, and while those are certainly no toys, but having DIY versions of those I would improve the design by having dedicated bass system for the lows, a second low-passed woofer close to the floor, a better suited mid-woofer and a better compression driver sewn together with phase linear filters- then it becomes cheaper, better and cooler than the originals.
But if I were me I would really look into CBT, line sources, Murphy arrays and huge constant directivity horn setups for this purpose. We're not playing with toys anymore, are we?
Either way the best results will only come if the room and speakers are planned as one.