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Communication Dans Un Congrès Année : 2020

Compression and expansion nonlinear effects in an electrodynamic loudspeaker: experiments vs. model failure

Résumé

An electrodynamic loudspeaker is known to be a non-linear device due to many physical phenomena resulting in position and current dependent loudspeaker parameters. The most common position-dependent non-linear sources are the force factor Bl(x) and stiffness Kms(x). These non-linear effects have many consequences, the most commonly used in measurements being harmonic distortion and intermodulation distortion. Another consequence is the compression effect of the dynamics. Due to a lower Bl(x) and a higher Kms(x) for larger displacements, one would expect a compression behavior, i. e. a decreasing ratio of X/U or X/I with increasing excitation level (X, I, and U are the displacement, current, and voltage, respectively). Nevertheless, measurements in the low frequencies of many loudspeakers show an expansion behavior, i.e., an increase in the X/U and X/I ratio with increasing excitation level. This non-intuitive behavior, which runs counter to the fundamental theory of simple models of Bl(x) and Kms(x), is studied and discussed in this paper.
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Dates et versions

hal-03231978 , version 1 (21-05-2021)

Identifiants

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Antonin Novak. Compression and expansion nonlinear effects in an electrodynamic loudspeaker: experiments vs. model failure. Forum Acusticum, Dec 2020, Lyon, France. pp.549-554, ⟨10.48465/fa.2020.0306⟩. ⟨hal-03231978⟩
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