Flux modulation is one of the main causes of distortion in electrodynamic loudspeaker units. A new compensation technique that eliminates this type of non-linearity using an additional compensation coil in the speaker unit is presented. An equivalent circuit model of the device including the compensation coil is derived. The compensation technique consists on feeding the compensation coil and voice coil with filtered versions of the wanted audio signal. Simulations show that a significant reduction in flux modulation distortion can be achieved with this technique. A simple magnetic circuit has been constructed to test the method on a real device, and the measurements show the method works, also when eddy currents are present.

Authors: Antonello, Niccolò; Agerkvist, Finn
Affiliations: Technical University of Denmark, Kgs. Lyngby, Denmark; KU Leuven, Leuven, Belgium(See document for exact affiliation information.)
AES Convention: 137 (October 2014) Paper Number: 9160
Publication Date: October 8, 2014
Subject: Transducers

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