Sunday, October 2, 1:30 pm — 3:00 pm (Rm 408A) Historical: H4 - Horns and Waveguides: Evolution of Technology

Alexander Voishvillo, JBL/Harman Professional Solutions - Northridge, CA, USA

Horns are undoubtedly the oldest audio equipment. There are two major functions of horns: providing high-efficiency of horn-loaded transducers (often in combination with phasing plugs in compression drivers,) and providing desirable SPL coverage and directivity control. The tutorial will consider such aspects of horns as derivation of basic horn wave equation (Webster Equation), analysis of directivity control, the role of the wavefront at the throat of horn on directivity of horns at high frequencies, influence of the high-order modes on performance of horns, influence of the mouth diffraction on performance, comparison of axisymmetric, elliptical, and rectangular horns. Also nonlinear propagation effects due are analyzed and explained. Retrospective review of patents is carried out as well as the review of the technical achievements of JBL Professional in horns and waveguides technologies
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