The nonlinear stiffness K(x) and the reciprocal compliance C(x) of suspension parts (spider, surrounds, cones) and passive radiators (drones) are measured versus displacement x over the full range of operation. A dynamic, nondestructive technique is developed which excites the suspension parts pneumatically under similar condition as operated in the loudspeaker. The nonlinear parameters are estimated from the measured displacement and sound pressure signal. This guarantees highest precision of the results as well as simple handling and short measurement time. The paper develops the theoretical basis for the new technique but also discusses the practical handling, interpretation of the results and their reproducibility.
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