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Time Variance of the Suspension Nonlinearity

It is well known that the resonance frequency of a loudspeaker depends on how it is driven before and during the measurement. Measurement done right after exposing it to high levels of electrical power and/or excursion giver lower values than what can be measured when the speaker is ‘cold’. This paper investigates the changes in compliance the driving signal can cause, this includes low level short duration measurements of the resonance frequency as well as high power long duration measurements of the non-linearity of the suspension. It is found that at low levels the suspension softens but recovers quickly. The the high power and long term measurements affect the non-linearity of the speaker, by incresing the compliance value for all values of displacement. This level dependency is validated with distortion measurements and it is demonstrated how improved accuracy of the non-linear model can be obtained by including the level dependency.

Authors: Agerkvist, Finn; Pedersen, Bo Rhode
Affiliations: Technical University of Denmark; Aalborg University(See document for exact affiliation information.)
AES Convention:125 (October 2008) Paper Number:7560 Import into BibTeX
Subject:Nonlinearities in Loudspeakers

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