I want one.

Regarding far-field diffraction, I can tell you stories about temperature differences in my room that throw off imaging and soundstage. I recently thought I had tweeter problems on one of my actives. It took me a long time to establish that what I was hearing was the result of a temperature gradient in my room and not a tweeter defect.

Klippels are used routinely in many industries.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated