A speaker system with a moving voice coil, sequentially comprising a front cover , a vibrating component and a magnetic circuit component from top to bottom, wherein the front cover is provided with a conductive material layer which constitutes a fixed electrode plate; the vibrating component comprises a vibrating diaphragm and a voice coil secured to the lower surface of the vibrating diaphragm and disposed in a magnetic gap formed by the magnetic circuit component; the vibrating component further comprises a flexible circuit board secured between the vibrating diaphragm and the voice coil , wherein a metal layer is disposed in the middle of the flexible circuit board and constitutes a movable electrode plate; a front cover solder pad is disposed on the front cover ; an external terminal is disposed on the front cover solder pad ; the fixed electrode plate is electrically connected to an external circuit by means of the external terminal ; the flexible circuit board extends to the outside of the speaker system and is provided with a solder pad electrically connected to the external circuit; the fixed electrode plate and the movable electrode plate are opposite to each other, configured for accumulating charges on the fixed electrode plate and the movable electrode to constitute a capacitor after the front cover and the flexible circuit board are electrified; a capacitance monitoring chip is further disposed in the speaker system with the moving voice coil and is electrically connected to the capacitor; and the vibrating component further comprises a vibrating diaphragm reinforcing portion secured to the upper surface of the vibrating diaphragm ; a hole is formed in the center of each of the vibrating diaphragm and the vibrating diaphragm reinforcing portion ; and the capacitance monitoring chip is disposed in the hole. the front cover is provided with a conductive material layer which constitutes a fixed electrode plate; the vibrating component comprises a vibrating diaphragm and a voice coil secured to the lower surface of the vibrating diaphragm and disposed in a magnetic gap formed by the magnetic circuit component; the vibrating component further comprises a flexible circuit board secured between the vibrating diaphragm and the voice coil , wherein a metal layer is disposed in the middle of the flexible circuit board and constitutes a movable electrode plate; a front cover solder pad is disposed on the front cover ; an external terminal is disposed on the front cover solder pad ; the fixed electrode plate is electrically connected to an external circuit by means of the external terminal ; the flexible circuit board extends to the outside of the speaker system and is provided with a solder pad electrically connected to the external circuit; the fixed electrode plate and the movable electrode plate are opposite to each other, configured for accumulating charges on the fixed electrode plate and the movable electrode to constitute a capacitor after the front cover and the flexible circuit board are electrified; a capacitance monitoring chip is further disposed in the speaker system with the moving voice coil and is electrically connected to the capacitor; and the vibrating component further comprises a vibrating diaphragm reinforcing portion secured to the upper surface of the vibrating diaphragm ; a hole is formed in the center of each of the vibrating diaphragm and the vibrating diaphragm reinforcing portion ; and the capacitance monitoring chip is disposed in the hole. <EOS>