Archives of Acoustics, 34, 4, pp. 579-590, 2009

Motor Nonlinearities in Electrodynamic Loudspeakers: Modelling and Measurement

Benoit MERIT
LAUM, CNRS, Université du Maine

LAUM, CNRS, Université du Maine

LAUM, CNRS, Université du Maine

Institute of Telecommunications, Teleinformatics and Acoustics

This paper studies the motor nonlinearities of a classical
electrodynamic loudspeaker. Measurements show the dependence of the voice-coil
inductance with its position and with the driving current as well as the force
factor dependence on the coil position. They allow the tuning of the parameters
of a model proposed for these dependences. Time and frequency analysis of the
model help in the explanation of both the harmonic and intermodulation
distortions observed in classical loudspeakers.
Keywords: electrodynamic loudspeaker; motor nonlinearity
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