Electro voice also took PWK concepts and ran with them. Look at the Patrician IV which was a gigantic Klipschorn an 18 inch woofer. There are traces of PWK all over the Electo Voice literature. This sort of business relationship is very interesting to me. Next time I get to talk to Mr.Hunter at Klipsch I'll have to ask about this.
It would be nice if Klipsch would write a Paul W Klipsch biography from more of a technical standpoint like the McIntosh and Quad books. A history of every speaker and prototype would be very nice.