A technique is described which can be used to extend the low-frequency response of a closed-box loudspeaker system by the use of an auxiliary active equalizer which converts the overall system response to that of a fourth-order Butterworth alignment. The technique can be applied to any closed-box system having a quality factor less than 1.31. For a closed-box system with a second-order Butterworth response, the technique extends the system lower -3 dB frequency by a factor of 1.85, or 0.886 of an octave.

Author: Leach, Jr., W. Marshall
Affiliation: Georgia Institute of Technology, School of Electrical Engineering, Atlanta, GA
JAES Volume 29 Issue 6 pp. 405-407; June 1981
Publication Date: June 1, 1981

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