An electro-acoustic system including an amplifier circuitry for amplifying an input signal to provide an amplified signal; and electrodynamic loudspeaker having at least one magnet, a diaphragm connected to a coil support, a voice coil for driving a diaphragm in response to the amplified signal with the presence of the magnet, and an electromagnetic impedance sensor coil partically offset with the at least one magnet for providing a feedback signal proportional to its electromagnetic impedance which is a function of both the moving speed and the displacement of the diaphragm; a negative feedback circuitry processing the feedback signal and providing a negative feedback signal; and a summing circuitry for combining the input signal and the negative feedback signal and sending a combined signal to the amplifier circuitry, which in turn provides an amplified combined signal to the electrodynamic loudspeaker to thereby reduce the distortion of the electrodynamic loudspeaker.