The modeling technique presented in Part 1 of the work is extended to three-dimensional space through the use of a flat tessellation of the horn mouth. This is made possible by a more complete version of the Kirchhoff-Helmholtz integral, which is applicable to a surface of arbitrary shape. The three-dimensional technique is effective with asymmetrical devices and produces better agreement with measurements at low frequencies and at angles near and beyond 90 degrees off axis.:
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