To promote realization of a multi-functional type acoustic device that is simple in structure and excellent in heat radiation with which quality of voice and music will not deteriorate even through low and high frequency signals are excited simultaneously.

This equipment is mechanically engaged with a rotor yoke axis 106. Between a rotor yoke 202 and an upper yoke 108, a heat radiation channel is provided so that a voice coil 102 can be engaged with a disk-like rotor yoke 202 and a speaker magnet 105 installed upon a flat part 202c of the rotor yoke 202. Then a cylindrical speaker void 103 is provided to compose a rotor 200 by arranging a cylindrical rotor permanent magnet 201 of which an outer peripheral side is magnetized in multi-polarity on an inner peripheral side 202b of the rotor yoke 202 and a stator 300 having a spider is oppositely arranged by way of a motor air gap 203. Then an eccentric weight 204 is firmly fixed to the outer periphery of the speaker magnet so that a big vibration exciting force can be generated by a centrifugal force.