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New Method of Characterizing Drive Linearity
A simple novel method of determining nonlinear parameters for electrodynamic loudspeaker drivers is presented and verified. The method requires substantially the same equipment as is required for linear (Thiele-Small) measurements, making it readily accessible to existing laboratories. Example linearity parameters are found and used to fit a model that is a logical extension of an existing model. The accuracy of extracted parameters is verified by comparing measured and simulated distortion in both acoustic and drive current measurements. Excellent agreement is found in the dominant second- and third-harmonic distortion, especially about the driver resonant frequency. The nonlinear parameters may be used to perform comparisons between drivers or to accurately model the linarity performance of separate parts of a driver and their impact on the performance of a system.
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