The directivity of a single loudspeaker driver is controlled by adding an acoustic reflector* to an ordinary driver. The driver radiates upwards and the sound is redistributed by being reflected off the acoustic reflector. The shape of the acoustic reflector is non-trivial and yields an interesting and useful directivity both in the vertical and horizontal plane. 2D FEM simulations and 3D BEM simulations are compared to free field measurements performed on a loudspeaker using the acoustic reflector. The resulting directivity is related to results of previously reported psychoacoustic experiments.

Authors: Pedersen, Jan Abildgaard; Munch, Gert
Affiliation: Acoustics Research, Bang & Olufsen, Struer, Denmark
AES Convention: 113 (October 2002) Paper Number: 5648
Publication Date: October 1, 2002
Subject: Transducers

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