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Omnidirectional Enhancement Of A Regular Polyhedron Loudspeaker

Student Name: Tengelsen, Daniel
Advisor Name: Leishman, Timothy W.
Approval Date: 8/1/2008
Report Type: Capstone
Title: Omnidirectional Enhancement Of A Regular Polyhedron Loudspeaker
Abstract: A regular polyhedron loudspeaker (RPL) is a sound source used by architectural acousticians to approximate an omnidirectional source. It is composed of a polyhedron enclosure (i.e., tetrahedron, hexahedron, dodecahedron, etc.) that is fitted with a loudspeaker driver in each face. Each face provides a distinct axis in which the RPL can radiate sound. At low frequencies, an RPL approximates an omnidirectional source. As frequency increases, the radiated sound begins to lobe in a multidirectional pattern. Measurements have shown that the omnidirectionality of most RPLs becomes poor above 1 kHz, which is well below the typical maximum frequency of interest. This presentation reports preliminary theoretical and experimental work aimed to better understand how the geometry of a loudspeaker driver affects an RPL's omnidirectional behavior. It also includes corollary evidence between the interstitial area of the RPL and its total omnidirectionality.
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