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Ranking of the Nonlinearities of Electrodynamic Loudspeakers

Ravaund R., Lemarquand G., Lemarquand V., Roussel T.

Archives of Acoustics

2010

Vol. 35, No. 1

49-66

The aim of this paper is to present a way of ranking the nonlinearities of electrodynamic loudspeakers. For this purpose, we have constructed a nonlinear analytic model which takes into account the variations of the small signal parameters. The determination of these variations is based on a very precise measurement of the electrical impedance of the electrodynamic loudspeaker. First, we present the experimental method to identify the variations of these parameters, then we propose to study theoretically the importance of these nonlinearities according to the input level or the input frequency. We show that the parameter which creates most of the distortions is not always the same and depends mainly on both the input level and the input frequency. Such results can be very useful for optimization of electrodynamic loudspeakers.

Motor Nonlinearities in Electrodynamic Loudspeakers: Modelling and Measurement

Merit B., Lemarquand V., Lemarquand G., Dobrucki A.

Archives of Acoustics

2009

Vol. 34, No. 4

579-590

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