Just something: my (Dutch) configuration of the model 19 is also very successful in the USA.

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Woofers: Altec 416-8B
Drivers: 288C with a 8 ohms Aluminum diaphragm (part 23763)
Horns: Electro Voice HR60
Tweeters: (the big) ESS Heil air-motion transformer
Crossover: N1201-8a (base) with big North Creek coils + increase for the tweeters.
Speaker cables/interconnects: 'black cat' cables (special made in France.)

Now listening is quite an experience, for me, for Bob and also for my audio friend here in Holland (he owns the JBL K2 S9800),
and that is big fun too.