Time Variance of the Suspension Nonlinearity

Finn T. Agerkvist, Bo Rohde Pedersen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    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.
    Original languageEnglish
    Title of host publicationProceedings of the 125th Audio Engineering Society
    Number of pages9
    Publication date2008
    Publication statusPublished - 2008
    Event125th Audio Engineering Society Convention - San Francisco, CA, United States
    Duration: 2 Oct 20085 Oct 2008


    Conference125th Audio Engineering Society Convention
    Country/TerritoryUnited States
    CitySan Francisco, CA
    Internet address


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