Magnetic circuit system and moving-coil type electroacoustic transducer with same

The invention provides a magnetic circuit system for moving-coil type electroacoustic transducers. The magnetic circuit system comprises an inner magnet, an outer magnet, an upper concentrating flux plate and a lower concentrating flux plate, wherein the inner magnet and the outer magnet are concentrically arranged, the inner magnet is encircled by the outer magnet, a gap is limited between the inner magnet and the outer magnet, the inner magnet and the outer magnet are stacked and fixed on the lower concentrating flux plate which is an integrated component, the upper concentrating flux plate is separated and comprises an inner upper concentrating flux plate portion stacked and fixed on the inner magnet and an outer upper concentrating flux plate portion stacked and fixed on the outer magnet, and the inner upper concentrating flux plate portion and the outer upper concentrating flux plate portion are separated. The magnetic circuit system is characterized in that an air hole is arranged at the center of the i