The article proposes to analyze individually each part that makes the loudspeaker up, specifically the diaphragm-surround set. Experiences were performed on low and medium amplitude displacement ranges. The paper uses traditional experimental methods to seek for the surround and diaphragm?s spectral signatures in the main eigenvalue region. Method consists in exciting the diaphragm-surround set by a reluctance transducer which was fed by an electric impulse, and analyze its response with an Eddy Current Displacement Transducer in the Frequency Domain. The most typical experimental spectral signatures of the nonlinear systems in free response are reviewed. This paper presents the results that were obtained after examining six samples, finding only one sample completely free of nonlinearities.
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