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Simulation of Horn Driver Response by Combination of Matrix Analysis and FEA

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To access performance of a horn driver (compression driver loaded by a horn), measurement of frequency response on-axis and off-axis must be carried out. The measurement process is time-consuming especially if the entire 3-dimensional “balloon” of responses is to be measured. Prediction of directional responses of the horn only (without compression driver) can be performed by the FEA (Finite Elements Analysis) or BEA (Boundary Elements Analysis). However, FEA or BEA of horn only provides relative directional properties of the horn. The SPL responses of horn driver at different angles remain unknown because these responses depend on interaction of electrical, mechanical, and acoustical parameters of the compression driver, and the acoustical parameters of the horn. New method based on combination of FEA and matrix analysis makes it possible to predict response of combination of various compression drivers and horns without actually measuring each combination and even without physically building horns. This method was verified during development of new AM series of JBL professional loudspeaker systems and showed high accuracy.

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