An electromagnetic electroacoustic transducer, includes: a diaphragm; a magnet;
an electromagnetic coil; and a casing for storing the diaphragm, the magnet and
the electromagnetic coil therein. The case has at least one first sound emitting
hole through which a front space on a front surface of the diaphragm in the casing
communicates with a front outer space in front of the casing and at least one second
sound emitting hole through which a rear space on a rear surface of the diaphragm
in the casing communicates with the front outer space in front of the casing. A
resonant frequency Fv2 of the rear space is set at a value in the range:
F02Fv1 in which F0 is a resonant frequency
of the diaphragm, and Fv1 is a resonant frequency of the front space.
