scope:

This PAS applies to the suspension parts of electroacoustical transducers (for example, loudspeakers). It defines the parameters and measurement method to determine the stiffness of suspension parts like spiders, surrounds, diaphragms or cones before being assembled in the transducer. The measurement results are needed for engineering design purposes and for quality control. Furthermore, this method is intended to improve the correlation of measurements between suspension-part manufacturers and loudspeaker manufacturers. The measurement method provides the effective stiffness, Keff, based on a linear model and the variation of the stiffness, K(x), versus displacement x using a non-linear model. Both parameters are measured dynamically by exciting the suspension part to mechanical vibrations.