I guess class D hybrid and Walsh drivers are as hip as I can get but my point was not the age of the design but that there are successful designs of most all configurations and coax drivers are not a magic tonic.
@russ69 I don’t think anyone in this thread has been pitching it as magic tonic for any and all audiophiles. I specifically disclaimer’d my 1st post with "Tannoys are not for everyone". However this IS a good place for coaxial and dual-concentric aficionados to express what they love about ’em. Which I did :)