Dynamical Measurement of Loudspeaker Suspension Parts

The nonlinear stiffness K(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.