In 1919, A. G. Webster published a paper on the theory of horns. Webster`s horn equation is based on a plane-wave assumption that is incorrect and this assumption severely limits the applicability of this theory to modern directivity-controlling devices. The historical development of horn theory is described, and a new acoustic waveguide theory is introduced. The new theory is free of the plane-wave assumption and yields designs which perform significantly better than present devices.
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