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Brief description of the drawings
FIG. 1 is a schematic sectional view showing a conventional microphone, FIG. 2 is a schematic
sectional view showing one embodiment of the present invention, and FIG. 3 is a characteristic
diagram of the embodiment of FIG. In the figure, 11 is a yoke, IIA is a second hole, 12 is a
magnet, 13 is a plate, 14A is a first hole, 15 is a diaphragm, 16 is a voice coil, 17 is an equalizer,
18 is a back cavity case, 18A Is an opening and 19 is a resistor.