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Looking at the pics from Oswalds Mill I'm curious to know about their theory and also make/model specifics. I tried to find data on the Lansing Heritage site but no luck. Can anybody point me to links for data sheets / info ?
Thanks !
Follow Ups:
There is not much info because multicells stopped being made a very long time ago, for reasons of cost, primarily. They are the most expensive type of horn to make, and tinsmiths are no longer part of our demographic. The multicells at the Mill are RCA 18cell fibre filled and roughly 300hz lower cutoff. They have their strengths and weaknesses, like any horn. Email me and I'll be happy to talk with you about my experiences if you like. There also will soon be a whole new Oswaldsmill audio domain, and it will have a forum, where things like this can be discussed. I'm thinking of calling it the "Better Sound Club."
Jonathan
To expand a bit on what Jonathan said, his 18 cell horns are of the type that were supplied by RCA in the late 1930s for their Shearer Horn type two way systems. The RCA horns were available with cells three rows high and 3,4,5 and 6 rows wide, to accommodate different shaped theatres. These horns were nominally 300Hz. cutoff, but actually have a flare expansion somewhat lower, like 160 or 180Hz. The horn has an outer casing, and all interior spaces are stuffed with some sort of fibrous material to dampen cell wall vibration. Jonathan's horns are extremely heavy- I was once in the wrong place at the wrong time and got to help him lug one of them up a flight of stairs.
I believe that the RCA individual cell dimensions are similar to the Lansing and later Altec Lansing 300Hz. multicellulars; these are all descendants of the horns built for the MGM Shearer Horn prototype systems of 1935. Jonathan's huge horns, each equipped with two RCA MI-1428B compression drivers (of the same period) provide a superbly lifelike, effortless and dynamic performance between 300Hz. and 7kHz.
"and tinsmiths are no longer part of our demographic"
Well I don't know about you but I know many tinknockers, in fact I was just working with a bunch of them outta the local in Peoria. If you want some just call the hall.
i live around a few here in maryland.. but they'd probably give you an earful if you asked 'em to 'knock out' anything but some HVAC ducts...
how WOULD a galvanized horn sound, i wonder? i guess my furnace IS a pretty efficient driver these days....
;P
d
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