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A Proposed Standard Method of Measuring the Directivity Factor "Q" of Loudspeakers Used in Commercial Sound Work

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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 inclousion 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 [1]-[7].

JAES Volume 21 Issue 7 pp. 571, 572, 574, 576, 578; September 1973
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AES - Audio Engineering Society