Patent ID: 7245729

Claim:
A loudspeaker, comprising: a box-form structure made from a single sheet of stiff lightweight sheet material having one or more folds which define a plurality of faces, with a first face and a second face of the structure respectively forming first and second panel-form bending wave acoustic radiators, the first and second faces being adjacent with a fold therebetween; and an electro-acoustic vibration transducer coupled to the first face to apply bending wave energy to the first radiator to cause it to radiate an acoustic output when an input signal is applied to the transducer, wherein the sheet of stiff lightweight material is sufficiently flexible at the fold(s) to be collapsible to a flat form for at least one of storage and transportation and re-erectable as a box form for use as a loudspeaker, and wherein the second face is driven by bending wave energy which is transmitted across the fold between the adjacent first and second faces.