Posted by Wayne Parham [ 65.214.102.163 ] on March 05, 2007 at 16:29:02:
In Reply to: Re: The Movement of Waves and Particles posted by DMoore on March 05, 2007 at 12:36:38:
Good catch. Thanks for the link to volvotreter.de! That's a very useful collection of articles. I've listed direct links to the Edgar article below, for easy access.
Seems to me, if a folded horn is expected to pass frequencies higher than one wavelength across its cross-section, then diagonal reflectors should be used. Rounded ducts can be used too, but then the wavefront will bounce from side to side. Rounded ducts work better if the cross-section is less than one wavelength. Far below one wavelength, the radius doesn't matter as much, and the curvature of the flare can be approximated with straight sections.
Edgar's article tends to agree with this, as shown in his Monolith horn article:
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