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A Generalized Active Equalizer for Closed-Box Loudspeaker Systems

An equalizer is described which extends the low-frequency response of a closed-box loudspeaker system. The equalizer consists of an auxiliary active filter that converts the overall system response to that of a fourth-order Butterworth alignment. The method used to realize the equalizer is general and can be extended to transfer functions other than fourth-order Butterworth. The circuit realization requires knowledge of the resonance frequency and total quality factor of the closed-box system.

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JAES Volume 38 Issue 3 pp. 142-146; March 1990
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