Specs for MK100A
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Thanks for the added tech info! What I see seems pretty typical of a 4" driver in a can with limited directionality below 2kHz and beaming above 6kHz.
I guess what to do depends on what you are trying to do. Getting anywhere near even coverage of a 10m x 5m (33' x 16-1/2') space with people standing and an 8' ceiling would definitely require more than one speaker as that creates a rather small coverage area per speaker. However, for this application even coverage may not really be a factor and the goal may instead be to draw patrons toward a specific point.
Many of the ceiling speaker manufacturers provide associated design tools. JBL and TOA offer downloadable design software specifically for their distributed ceiling speaker products while Tannoy and QSC offer versions of EASE Address for the same purpose. SoundTube has a simple online calculator for recommended spacing and Atlas provides an Excel spreadsheet for their Strategy series speakers. These are intended to be used for typical situations and some, if not all, may not allow for modeling features such as sloped ceilings. If you want to do that then most of the manufacturers also provide EASE and/or CLF data that can be used in other modeling programs.