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Brief description of the drawings
FIG. 1 is a longitudinal sectional view of a conventional loudspeaker unit, FIG. 2 is a longitudinal
sectional view of a loudspeaker showing one embodiment of the present invention, and FIG. 3 is a
characteristic comparison between the loudspeaker of the present invention and a known
loudspeaker. DESCRIPTION OF SYMBOLS 1 ... Sealing frame, 2 ... Magnetic circuit, 3 ... Voice coil,
4 ... Battle buffer 15 ... Course diaphragm, 5 a ... Edge of diaphragm, 6 ... Spacer , 6a ... air holes.