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A Simple Theory of Cabinet Edge Diffraction

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Asymptotic diffraction results, valid at high frequencies for an infinite wedge, are used to derive an equivalent edge source strength, which can then be applied to the finite edges of a loudspeaker cabinet. Diffraction amplitudes are about 73% larger than earlier work and display a strong dependence on observation angle. Computation of the diffraction is very efficient when carried out in the time domain, and second- and third-order effects can be included. Comparison with a boundary-element calculation in the literature confirms the basic validity of the theory, and experiments show the expected inversion of the diffracted sound on the two sides of the shadow boundary.

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JAES Volume 39 Issue 12 pp. 923-933; December 1991
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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=5952

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