Beats me.
I am very much an omnidirectional speaker devotee. My trajectory leads to German Physiks, Duevel, Morrison Audio, and maybe Ohm Acoustics. See Morrison Audio for Don Morrison's latest writing, the most he's written in years and an excellent summary of point-source omnidirectional. Note: NOT polydirectional. Big difference.
I find the test/measurement strategy here interesting. Go figure this is in Germany; they are absolutely on to something with the "real sound" of MBL, G. Physiks, and Duevel. This is not a coincidence. To the best of my knowledge, nobody has bothered to figured out a good way to measure omnidirectionals, maybe due to small market share. For review measurements, there's always the "take with grain of salt" factor, so for example the actual dB sensitivity is always slightly higher in real life.