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Compensation Filters for Excess Exciter Excursion on Flat-Panel Loudspeakers

Inertial exciters are used to actuate a surface into bending vibration, producing sound, but often have a high-Q resonance that can cause the exciter magnet to displace enough to contact the bending panel. The magnet contacting the panel can cause distortion and possibly even damage to the exciter or panel while having a minimal contribution to acoustic output. A method is outlined for deriving a digital biquad filter to cancel out the excessive displacement of the magnet based on measurements of the exciter’s resonant frequency and Q-factor. Measurements of exciter and panel displacement demonstrate that an applied filter reduces magnet excursion by 20 dB at the resonant frequency.

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