The present invention discloses a speaker system with a moving voice coil. A conductive material layer is disposed on a front cover of the speaker system and constitutes a fixed electrode plate. A vibrating component comprises a flexible circuit board secured to one side of a vibrating diaphragm. A metal layer is disposed in the middle of the flexible circuit board and constitutes a movable electrode plate. The fixed electrode plate is electrically connected to an external circuit by means of an external terminal disposed on a front cover solder pad. 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. A capacitance monitoring chip is disposed in the speaker system and electrically connected to a capacitor.