811 Fins

[Old Guy]

Hi Old Guy, thanks for your reinforcement of my 811 fin theories. Just a tiny comment... Jim Lansing did seem to like multicellular horns, as they were the only type he used. The last one he designed was the H-1000 which was used with the 175 driver in his postwar 1200Hz. crossover two way Lansing Sound systems:

http://www.lansingheritage.org/image...1948/page7.jpg

Jim died in late 1949 and within a year or so William Thomas had secured the services of Bart Locanthi, who designed the small potato masher "Koustical" horn (later 175DLH) and the large masher theatre horn for the 375. The folded and flat plate lense horns came soon after. His work was based on that of Kock and Harvey of Bell Labs who had published a paper on acoustical lenses in 1949. Mr. Locanthi's wife was an optics engineer, and likely provided guidance as well.

As I have heard the story, JBL added the Vitavox-built multicellulars to the line in the 1970s so their dealers could bid on contracts that were written to virtually specify Altec equipment. These horns were sourced through Dukane (I think), who also marketed these horns under their name.

Ahh.

An ex JBL employee had me convinced he had turned against them.

Your last paragraph coincides with what I got from guys at DuKane.