Motional feedback

A type of mechanical negative feedback where the actual motion of the cone of a low-frequency loudspeaker is used to generate a signal that is fed back to the amplifier. The motion of the cone itself is then inside the feedback loop, and distortion can be significantly reduced. In all motional feedback schemes, great care must be exercised to ensure that the system is stable. This means that phase-shift between the drive signal and the feedback signal must be accurately controlled.

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