Measurement of the acoustic impedance of multi resonant systems - a prior step to determine parasitic resonances in magnetic circuits of loudspeakers

This paper is focused on the measurement of the acoustic impedance of multi-coupled resonators using an impedance tube; results of measurements of different arrangements are shown in this work. It is well known that parasitic resonances can have negative effects on the frequency response of transducers, in order to analyze the effectiveness of the technique, geometries similar to the ones used in magnetic circuits of loudspeakers are also tested. The results are discussed in the conclusions.