Well, let´s wait for the measurements.. I have actually designed and produced active speakers of similar construction, with bigger 4,5 inch BMR driver fullrange, playing down to 300 Hz, and bass section with TB speakers 5 1/4 subwoofer and Wavecor 7 inch passive radiator. The BMR drivers have certain wow effect, and some qualities, but...
but the mentioned wide-dispersion is not exactly true, or it is actually very non-linear, and difficult to adjust in crossover or DSP.
This is also in my opinion the reason why the Naim company was not very sucessfull with it. The driver that i am using in the Virtuoso speakers
is the same as used in Rega RS10 speakers as midrange only.
Here is a link to my design, if you want to have a look
https://www.gravelli.com/en/product/audio-en/virtuoso/