If you weren't born rich  you might have trouble digesting the idea of spending $150,000 on speakers, but imagine the glorious sound it would produce!
Apparently the spherical shape of the cabinet loading the woofer presents numerous sound advantages. The first co-axial unit ever produced by Cabasse was the Diphone, designed in the early 50s by Georges Cabasse to supply movie theaters going multi-channel when Cinemascope was launched in Europe. This solution consisting of a tweeter in the heart of a concave membrane acting like a moving horn was quickly dropped, the benefits from the co-axial lay-out being overbalanced by numerous directivity and coloration problems. Can you say glitzy geek gear?!