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Line Array Performance at Mid and High Frequencies

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The paper is focusing on the direct sound frequency response of line arrays - rectlinear or curved - at mid and high frequencies (1kHz - 10kHz) which is arguably the most important range and one that is relatively easy to measure. In this frequency range a line array may produce irregular on-and off-axis frequency responses in the audience area. Which is difficult to predict using simpler models. The irregularities, which appear as frequency varying attenuation, depend in a complicated way on array configuration and air absorption. Array performance prediction software usually models a line array as a number of directive point sources placed on a line or curve. The directive point source model has been used to simulate line arrays to study the frequency response behaviour of line arrays at mid and high frequencies. The results of the study are compared with frequency response predictions calculated by new software including multi-channel array controller simulations and measured complex spherical polar data for a specific 3-way line array cabinet. The predictions are compared to direct sound frequency response measurements on line arrays using the same 3-way cabinet to show the degree of accuracy with which directive point source models can predict the frequency responses of line arrays.

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