Directivity is one important parameter to define the behaviour of a loudspeaker. There are many techniques and standards about directivity measurements in anechoic chambers but in situ measurements of flush-mounted loudspeakers show some specific problems. This contribution develops a procedure to measure directivity under the special conditions of a non-environment listening room, introducing the techniques utilized, the problems found with the proposed solutions and discussing the limitations of the process. The existence of reflections, baffling effects due to adjacent walls and a comparison to theoretical models of the radiation of a piston are discussed.

Authors: Fernández-Comesaña, Daniel; Rodriguez-Garcia, Paúl; Torres-Guijarro, Soledad; Pena, Antonio
Affiliations: Laboratorio Oficial de Metroloxía de Galicia (LOMG), Tecnópole Ourense, Spain; University of Vigo, Vigo, Spain; Institute of Sound and Vibration Research (ISVR), Southampton, UK(See document for exact affiliation information.)
AES Convention: 128 (May 2010) Paper Number: 8057
Publication Date: May 1, 2010
Subject: Room Acoustics, Sound Reinforcement, and Instrumentation

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