Ranking of the nonlinearities of electrodynamic loudspeakers

Romain Ravaud (1) , Guy Lemarquand (1) , T. Roussel (1) , Valérie Lemarquand (1)

1 LAUM - Laboratoire d'Acoustique de l'Université du Mans

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 the most 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 optimizing electrodynamic loudspeakers.

Domaines: Electromagnétisme; Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

Romain Ravaud, Guy Lemarquand, T. Roussel, Valérie Lemarquand. Ranking of the nonlinearities of electrodynamic loudspeakers. Archives of Acoustics, 2010, 35 (1), pp.49-66. ⟨hal-00438763⟩