Existing directivity-control theory has been expanded yielding a unique horn design. This design improves on many of the problems present in "prior-art" horns, including vertical polar widening at low frequencies, poorly shaped polar response curves, and poor front-to-back energy control. Several directivity-control mechanisms are introduced which define the new "Manta-Ray" horn geometry. These include a tall, nonradial mouth and a quadric horn bell. Directivity-response performance is presented.
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https://aes2.org/publications/elibrary-page/?id=3249
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