Multiactuator Panels (MAPs) are flat loudspeakers that can be used to build arrays for Wave Field Synthesis (WFS), alternatively to classical dynamic loudspeakers. The sound radiation of these loudspeakers is a complex superposition of excited modes mat vary strongly with frequency. Therefore, the characteristic MAP spectrum is very irregular and needs to be equalized to obtain a flat, colorless response. In this paper, an efficient digital equalization method is applied successfully to the problem of spectral equalization of MAPs. It is based on a chain of second-order sections of infinite impulse response parametric filters with very low computational cost. The method compensates for the measured MAP response in order to achieve a desired frequency response. The equalization process has been applied to a large MAP prototype, comprising a large number of exciters within a panel. A dedicated exciter equalization and its consequences on the filtered responses have been addressed.
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