The growing use of the directivity factor Q for determination of critical distance, limiting distance, articulation loss of consonants, attenuation with increasing distance, ratios of direct-to-reverberant sound, loudspeaker efficiencies, and therefore, its inclusion in specifications, makes it advisable to adopt a standard approach to its measurement. This paper details such a method, already in use by a major manufacturer, and encourages its adoption by the industry as a whole.
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https://aes2.org/publications/elibrary-page/?id=1716
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