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