a frame;

a vibration system supported on the frame;

a magnetic system with a magnetic gap supported on the frame;

the vibration system includes a diaphragm assembly having a diaphragm and a coil inserted in the magnetic gap to drive the diaphragm for sound generation;

the diaphragm assembly includes a diaphragm holder fixed to the frame and the diaphragm fixed to the diaphragm holder for sound generation;

the diaphragm includes a first flat part having an opening, a folded ring part in the shape of a ring on the outside of the first flat part, and an attachment part on the outside of the folded ring part and fixedly connected to the diaphragm holder;

the diaphragm assembly also includes a waterproof breathable film fixed to the first flat part, the first flat part includes a first inner edge away from the folded ring part; observed along the vibration direction, the first inner edge is located on the inner side of the coil, and an outer edge of the waterproof breathable film is located on the outer side of the coil.