I am glad to see this speaker tested because I have been curious about it. When I look at the graphs the thing that stands out to me, as the notable weakness of this speaker, is the narrowness of the listening window in the vertical plane, to avoid the nulls caused be interference between the big dome and the ribbon tweeter. The window appears to be about +/- 20 degrees at best. This is attributable to the integrated, combined effect of the high frequency of the crossover point (in the neighborhood of 5.5 kHz apparently) and the spacing between the mid-tweeter and the tweeter. The spacing looks like it is maybe about 4", and the wavelength at 5.5 kHz is about 2.5". I can't help but think that it would be better if the ribbon were a simple 3/4" tweeter with a very small flange. Or maybe a 1" tweeter so that the crossover point could be lower. But it is without doubt an excellent speaker and one that I would seriously consider buying, because I just like 3-way speakers.