Current feedback is a versatile method of modifying the behavior of a loudspeaker driver with opportunity for linearization and matching the driver to the enclosure design targets, but depending on the chosen approach a potential risk of increasing the effects of either voice coil impedance variation or driver mechanical parameter nonlinearity, and the current feedback approach needs to be designed to keep these effects well controlled for the intended application. This work compares using a nonlinear simulation model various forms of current feedback, including current drive, finite positive or negative amplifier resistances, negative resistance with reactance. This final part of the work extends the examples given in the earlier papers and presents a feedback approach that would appear to offer benefits in both distortion and thermal compression control.
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