Speaker

A speaker, comprising:

• a frame;
• a vibration system fixed to the frame;
• a magnetic circuit system fixed to the frame;
• a front cover disposed on the frame;
• a sealing diaphragm;
• and
• a sound outlet formed on a side of the speaker, wherein
• the magnetic circuit system comprises a bottom plate, a first magnetic unit disposed on the bottom plate, and a second magnetic unit disposed on the bottom plate and spaced apart from the first magnetic unit for forming a magnetic gap;
• the vibration system comprises an upper diaphragm, a lower diaphragm in an annular shape and spaced apart from the upper diaphragm, a skeleton connected between the upper diaphragm and the lower diaphragm, and a voice coil fixed to the skeleton and located in the magnetic gap;
• the upper diaphragm comprises an inner suspension fixed to the first magnetic unit, an outer suspension surrounding the inner suspension and fixed to the frame, and a dome connected between the inner suspension and the outer suspension;
• the skeleton comprises a fixing part fixed to the dome and an annular enclosure wall extending in a direction close to the lower diaphragm from an outer edge of the fixing part and arranged between the frame and the magnetic circuit system;
• the lower diaphragm is connected between the frame and the annular enclosure wall;
• the sealing diaphragm is connected between the frame and the annular enclosure wall;
• the upper diaphragm and the front cover form a first front cavity;
• the annular enclosure wall, the sealing diaphragm, the lower diaphragm and the frame form a second front cavity;
• both the first front cavity and the second front cavity communicate with the sound outlet.