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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 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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AES - Audio Engineering Society