Fri Apr 26, 2013 11:34 pm
doesn't matter. as long as the cross-sectional area follows the properties of a proper acoustic horn, it doesn't matter if it's round, square, oval, elliptical, or just totally jacked up.
well, sort of. if you want equal dispersion in all directions, then you want a horn shape which is symmetric in both axes. if it's non-square rectangular or oval/elliptical, it'll have narrower dispersion along the minor axis of the horn's mouth.