Abstract
For reasons of consistency, many room acoustics measurements (e.g., ISO 140-4 and ISO 3382) require the excitation of sound fields via omnidirectional sources. For years, acousticians have used dodecahedron loudspeaker enclosures with individual loudspeakers mounted on each face as conventional ‘‘omnidirectional’’ sources. However, frequency-dependent interference between loudspeakers, diffraction effects, and inherent directivities of individual loudspeakers must contribute to a departure from the omnidirectional ideal. As a result, criteria have been established to limit the maximum allowable deviations from omnidirectional radiation for qualified measurements. Despite such concessions, acousticians should consider an important question: is anything extraordinary about the dodecahedron loudspeaker configuration? The dodecahedron is merely one member of a family of five platonic polyhedrons. Other members of the family include the tetrahedron, hexahedron, octahedron, and icosahedron. How do the omnidirectional characteristics of loudspeaker systems based on these latter geometries compare to those based on the dodecahedron? This paper discusses several theoretical, numerical, and experimental results that provide answers to this question.
Published Version
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