A point of clarification if I may.... and this presumes I'm understanding you correctly to suggest the early Jubilee's didn't have signal alignment and the new ones do.
Great post. I was there too. Yes Roy also impressed Paul Klipsch when he went active on the Khorns and time aligned them too!
One of my best friends, now retired home builder, has a terrific wood shop with all the tools. He only builds Direct Radiator speakers, and is "dig my heels in the dirt" about the MYTH, that passive "sound better." He has a large collection of Coils and Capacitors in huge metal cabinets in climate controlled basement, across from several of his past speakers, that would easily sell for $20,000 to $60,000 at Axpona.
I sent him down the Open Baffle journey 12 years ago, and he has not come back to Horns (he had LaScalas almost 50 years ago and I helped him build Monkey Coffin Subwoofer for it)............. so, there is still hope.
Each his passive networkstakes6 months to a year to tune to his terrific/beautiful sound ROOM. I just think Horns are above his pay grade and hates it when he hears mine sounding better than his, and won't admit it. Ego and "always right" mentality is part of it. He is also great at choosing really good music and recordings as compensation, but I digress.
This is a widespread disease, propagated by "StereoPhool" and "Absolutely Soundless" magazines that cater to their ADVERTSERS and write Prose for a living. Basically no one believes the TRUTH, which was PWK's Silver Medal Award............MODULATION Distortion is the speaker killer, yet the lemmings still go over the cliff in the direct radiator Fog.
Like any of Society's critics, they can't "do it" so all they can do is write about it. PWK used to call them "the Lay Press" for a reason. They can really lay down the BS. every month, tirelessly.
Only in Engineering can find the Truth with most of the BS filtered out. But since engineers work for sales and marketing people in companies, they have to do what they are told and go along with SOME of the BS in order to make sales happen. Roy, as Paul's apprentice, is a NO BS type of guy and a very competent horn designer. Just sayin'.