The results obtained by a loudspeaker equalization method are presented and compared with other equalization methods. The main characteristic of the proposed method resides on the fact that the equalizer structure is planned from the beginning as a chain of SOS (Second Order Sections), where each SOS is a low-pass, high-pass or parametric filter defined by its parameters (frequency, gain and Q), and designed by a direct search method. This filter structure, combined with the subjectively motivated error function employed, allows obtaining better results from a subjective point of view and requiring lower computational cost. The results have been compared with different FIR (Finite Impulse Response) and IIR (Infinite Impulse Response) filter design methods, with and without warped structures. In all cases, for the same computational cost, the presented method obtains a lower error function value.
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