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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