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Asymmetric All-Pass Crossover Alignments

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A family of asymmetric crossover filters is investigated that expands the established all-pass set. A general method of determining complementary crossover filters with an all-pass composite response is presented with a method of reflecting the crossover asymmetry about the crossover region. Several example filters are included. CAD techniques are used to verify the basic approach, and a simple application to a satellite-subwoofer loudspeaker is described where asymmetry in the crossover frequency response and the resulting overlapping of the high-pass and low-pass responses are shown to improve the effectiveness of filter attenuation. However, because of asymmetry in the high-pass and low-pass phase responses and the resulting polar response irregularity in association with noncoincident drive units, the application regime for these alignments is restricted to low frequency.

JAES Volume 41 Issue 3 pp. 123-134; March 1993
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