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RonyWeissman wrote:

A mid-bass horn for my Altec 515-8G drivers operating from 100-600hz

Rony, I think your wish to have mid-bass horn with 515G is a bit faulty. A mid-bass horn for 515G shall be 50-600 Hz. Let me to explain. The 515G has 37Hz resonance frequency, in practice 40-45Hz. That would make it a perfect driver form 55-65Hz horn. One would ask: why do not make 100Hz horn and just to cross it a driver higher. There are two answers. First: a need of use a high order high-pass crossover. Second: 100Hz horns is about 40” mouth but you have a 15” driver, so how low big would you do the throat? 10-15” of throat to 40” mouth is good but if you can go to 4-6” throat then you will have better EQ at 100Hz. You might not be able to go for 4-6” throat with 15” driver.

So, I feel that 515G is too good driver for 100Hz. I would look for much smaller driver. There are plenty people who did short horns around 515G, with full 15” throat and small mouth. They are not particularly good sounding solutions. The 515G is itself has good sound and might work very fine (I would say not fine but better then other crap I have seen) as direct radiator in short and wide horn but ONLY if you have a very small room. I would say 250-300sq feet it maximum. If you push this driver harder if bigger room then you won’t get good sound. So, you need the pressure was coming not from the driver exertion but from horn EQ. You need a longer form for it and a narrower throat.

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