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A Simple Theory of Cabinet Edge Diffraction

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Asymptomatic 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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