Abstract
A laminated composite panel-form loudspeaker (6) consists of a peripherally stiffened laminated composite radiating panel (40) on which a preselected number of transducers (50) are mounted and a rectangular frame (10) carrying a flexible suspension device (20) which supports the panel radiator (7). The laminated composite radiating panel (40) comprises a predetermined number of orthotropic laminae with predetermined specific moduli and stacking sequence. The peripheral edge of the laminated composite radiating panel (40) is reinforced with strips (60) of which the rigidities are determined in such a way that beneficial natural normal modes of the radiating panel (40) are excited and satisfactory operation of the panel radiator (7) over a desired acoustic frequency range achieved. The standing waves at the peripheral edge of the stiffened radiating panel (40) are damped out via the use of the flexible suspension device (20). The transducers (50) are situated at predetermined locations in a preselected feasible region (30) on the panel radiator (7) so that relatively high radiation efficiency and uniform spread of sound intensity spectrum can be produced by the panel radiator (7) over a desired operative acoustic frequency range.
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