Conventional loudspeaker membranes generally use cone or dome shapes, which permit the increase of the first frequency which presents a non-rigid body motion behavior, the so-called break-up frequency. A flat membrane for example has a minor geometrical stiffness if compared to standard shapes, bringing some vibration problems. On the contrary flat membranes have an interesting potential, which is a wide dispersion characteristic in the high-frequency range. A new mechanical device is presented to control loudspeaker flat membrane vibrations and it relies on both mechanical driving and damping. Both virtual and physical loudspeaker prototypes are developed and then compared using simulations and measurements.
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