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Brief description of the drawings
1 and 2 are half sectional views of a conventional flat panel loudspeaker, and FIGS. 2 and 3 are
detailed views of a portion A of FIG. 1 and FIG. 4 are output sound pressure frequency
characteristics of the flat panel loudspeaker and FIG. It is sectional drawing of one Example of
this invention. 1 ······· Flat plate diaphragm 2 ······· Drive cone, 3 ······· Voice coil bobbin, 4 ······ Voice
coil, 5 ······ Damper.