The invention discloses an electroacoustic conversion device, comprising a vibration
system and a
magnetic circuit system with a magnetic gap. The vibration
system comprises a vibration membrane, a
voice coil combined below the vibration membrane and suspended in the magnetic gap, a piezoelectric plate combined at one side of the vibration membrane, a first frequency dividing circuit connected with the
voice coil, and a second frequency dividing circuit connected with the piezoelectric plate. The first frequency dividing circuit performs frequency dividing on an external input first path sound
signal so as to obtain a
low frequency signal and outputs the
low frequency signal to the
voice coil. The second frequency dividing circuit performs frequency dividing on an external input second path sound signal so as to obtain a
high frequency signal to drive the piezoelectric plate. The electroacoustic conversion device has both a moving coil sounding structure and a piezoelectric sounding structure, and has two frequency
dividing circuits; when a
high frequency signal is input, the piezoelectric plate drives the vibration membrane to vibrate to give out sound; when a
low frequency signal is input, the voice coil, under the action of a
magnetic field, drives the vibration membrane to vibrate to give out sound, so that a super
wideband electroacoustic conversion device with good performance is realized.