This paper investigates the creep effect, the visco elastic behaviour of loudspeaker suspension parts, which can be observed as an increase in displacement far below the resonance frequency. The creep effect means that the suspension cannot be modelled as a simple spring. The need for an accurate creep model is even larger as the validity of loudspeaker models are now sought extended far into the nonlinear domain of the loudspeaker. Different creep models are investigated and implemented both in simple lumped parameter models as well as time domain non-linear models, the simulation results are compared with a series of measurements on three version of the same loudspeaker with different thickness and rubber type used in the surround.

Authors: Agerkvist, Finn; Thorborg, Knud; Tinggard, Carsten
Affiliations: Technical University of Denmark; Tymphany A/S(See document for exact affiliation information.)
AES Convention: 125 (October 2008) Paper Number: 7561
Publication Date: October 1, 2008
Subject: Nonlinearities in Loudspeakers

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