They can be improved by modifications to a completely superior level.

yup... introduced in the 1940s and still in production today.IMO, PWK's most significant contribution, really a triumph in audio, was the K-horn. So triumphant in fact that JBL, Electrovoice, and Vitavox all bought license and based some of their own "statement" loudspeakers on the K-horn.
I have Khorns, 19's, A-7s, and larger VOTTs. and have owned Cornwall, Choruses, and Fortes. They all sound good and they're all different. What they share is their horn design and their efficiency.
Horns and tubes baby!...![]()