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A Motion Transducer for Low-Frequency Loudspeakers

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A simple motion transducer is described which provides an analogue of voice coil position, and a novel design feature yields good linearity over a useful span. Its output may be used directly for excursion limiting and digital correction of motor nonlinearites. Integration of the position output enables precise mean-position control in high compliance drivers. Differentiation of the position output provides velocity feedback.

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