Some basic relationships of feedback systems are reviewed. In particular, attention is paid to an optimum choice of controller. The general optimization technique of Kessler is described and applied to control systems with only one dominant time constant. It is shown that this general procedure can also be used for a loudspeaker system. An equivalent control circuit for a loudspeaker is derived, and the state-variable feedback design may be applied. A practical loudspeaker feedback system is described. Attention is paid to the general concept of this system and to the Kessler optimization technique. The circuits used in this system, the system design, the measurements, and the results are discussed.
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