Patent ID: 6826285
Filing Date: 2004-11-30
Classification: H04R

Abstract:
A loudspeaker comprising a panel which is sufficiently stiff to support bending waves, the panel having a boundary, a transducer mounted to the panel to apply bending wave energy in the form of dispersive travelling waves thereto at a first location in response to an electrical signa applied to the transducer to cause the panel to vibrate and radiate an acoustic output, the loudspeaker having a frequency range extending from a lower frequency to a higher frequency and the panel having a stiffness giving a coincidence frequency above the lower frequency, and comprising means on or associated with the panel at a second location to attenuate travelling bending waves in the panel at least substantially to moderate panel resonance, the attenuating means comprising mechanical impedance means at a panel boundary which is matched to the mechanical impedance of the panel to provide absorption of bending wave energy reaching the panel boundary at a frequency within the operating frequency range of the panel.