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RE: AGAIN Why no rear and front HORN loaded MIDRANGE drivers in Pro sound ?

Posted by Paul Eizik (A) on December 12, 2014 at 11:21:56

In Reply to: AGAIN Why no rear and front HORN loaded MIDRANGE drivers in Pro sound ? posted by Rafaro on December 11, 2014 at 17:55:36:

Rafaro

What you are describing was invented in the 1930's by H.F. Olson. It was called a Compound Horn Loudspeaker in the patent (do a google search to see Olson's original patent which was granted in 1940 right before WW2). This configuration is also known as a double loaded horn. Olson's design used a single cone driver while you propose using 4 8" drivers. You would need to face the 8" drivers toward each other on the horn walls in a manner similar to Tom Danley's Unity horn, which used computer modeling to get the several drivers to work together as I recall. You would need a complex manifold at the rear of the 8" drivers to couple them to the rear horn. Olson's rear horn was bifurcated, that is it split in two parts which joined together further along, and then followed into an "S" bend into the horn mouth. The 80 Hz lower end is realistic, however getting smooth response to 2000 Hz from those 4 facing 8" drivers on the front horn would be tricky, involving a lot of experimentation, "cut and try" and probably EQ (which is going to be there anyway in a PA). This is most likely the reason you don't see designs like this in PA's, it's rather complicated compared to conventional designs. BTW the acoustical crossover between the rear bass horn and the front mid horn in a design like Olson's is typically in the 200 Hz region, and there will a dip in the response in this region where the front and rear out puts add together out of phase, however 200 Hz is well out of the midrange, and the output of the rear horn will also be delayed from the mid by about 1 millisecond for every 1 ft. of bass horn length. Back loaded horns (like many Lowther designs) will have this same dip and delay, and I've never read or heard anyone commenting that it's particularly a problem in them.

It's possible, but don't expect it to be easy.

Paul

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