Extract

This study examines the performance of a directivity-controlled loudspeaker designed for room acoustics measurements. The loudspeaker consists of a single driver mounted on one face of a sealed dodecahedral box. Measurements are made successively with the loudspeaker rotated onto each face (using an acoustically transparent suspension system), and the measured room impulse responses can then be combined post hoc to yield the effect of a source with arbitrary directivity (with an accuracy up to 2nd order spherical harmonics).

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