The maximum sound reinforcement attainable in large reverberant halls is highly dependent on the directional properties of the loudspeakers used, particularly in the lower frequency range. A method of designing loudspeakers for unidirectional sound radiation will be presented. Frequency response curves for such loudspeakers will be compared to those for conventional enclosure and applications will be considered.
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https://aes2.org/publications/elibrary-page/?id=1910
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