The compliance of the loudspeaker suspension is known to depend on the recent excitation level history. Previous investigations have shown that the electrical power as well as displacement and velocity plays a role. In this paper the hypothesis that the changes in compliance are caused mainly by how much the suspension has been stretched, i.e. the maximum displacement, is investigated. For this purpose the changes in compliance are measured when exposing the speaker to different levels and types of electrical excitation signals, as well as mechanical excitation only. For sinusoidal excitation the change in compliance is shown to depend primarily on maximum displacement, but for square pulse excitation the duration of the excitation also plays an important role.
Agerkvist, Finn; Pedersen, Bo Rohde
Affiliations: Esbjerg Institute of Technology, Aalborg University, Aalborg, Denmark; Technical University of Denmark, Lyngby, Denmark(See document for exact affiliation information.)
AES Convention: 127 (October 2009) Paper Number: 7902
Publication Date: October 1, 2009
Subject: Transducers Manufacturing and Equipment
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