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In the Forum: Horn-Loaded Speakers
In the Thread: Magico: Robert Harley’s upperbass mouth.
Post Subject: Flare Termination - The Area 51 of horns.Posted by Romy the Cat on: 2/20/2006

 hagtech wrote:
Sorry to steer away from Harley, but have you Horn guys ever tried different flare terminations?  That is, the boundary condition where the mouth and room meet.  I once saw some interesting stuff done on large radio antennas that improved gain (efficiency) or perhaps bandwidth by adding "petals" to the edges of the horn.  Sort of made the mouth look like a daisy.  Perhaps it was to make the transition to low impedance air a little smoother.  Not sure if there are analogs with broadband impedance converters in microwave transmission lines.

Maybe a flare that turns a full 180 degree outward is good enough.  I don't know.  Maybe it is related to the lower cutoff frequency.  I believe you get some odd phase or impedance effects at that transition.  Such flare modifications (stolen from mother nature's flower design) might smooth this out.  If so, could eliminate some crossover components.
Jim, I understand where are you coming from. I do not think that anymore, including me, would be able to answer this question defiantly. There are different schools of thinking and different implementations for the different profiles but none of them prove anything, rather confuse the subject. Even if we pretend that we took a horn, submerge it into a pool with clean water, slowly to pump ink through the horn’s bell and to observe the actual propagation of ink stream after it left the horn’s flare then we still would not have a generic rule and generic relationship between the flare termination, many other horns parameters and the actual Sound that we get out of this horn. What I feel that people do what they do (using practicality and purely intellectual considerations) and then try to justify afterfact that their flare termination does serve some benefits.

However the large baffles near Flare and parallel to flare are totally different story and their very negative ever is very much observable and predictably curable.

Rgs,
Romy

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