Speaker

A speaker, comprising:

• a first frame;
• a second frame relatively fixed with the first frame and cooperatively forming a receiving room with the first frame;
• a first vibration system supported on a side of the first frame distal to the second frame, the first vibration system comprising a first diaphragm and a first voice coil connected with the first diaphragm and driving the first diaphragm to generate sounds;
• a second vibration system supported on a side of the second frame distal to the first frame, the second vibration system comprising a second diaphragm and a second voice coil connected with the second diaphragm and driving the second diaphragm to generate sounds;
• and
• a magnetic circuit system located in the receiving room to driving the first vibration system and the second vibration system, the magnetic circuit system comprising:
• a first main magnet proximal to the first vibration system;
• a plurality of first auxiliary magnets located outside the first main magnet and forming a first magnetic gap with the first main magnet;
• a second main magnet proximal to the second vibration system;
• and
• a plurality of second auxiliary magnets located outside the second main magnet and forming a second magnetic gap with the second main magnet;
• wherein a projection of the second voice coil along a vibration direction of the speaker is located in the first voice coil, and the projection of the first voice coil on the magnetic circuit system along the vibration direction of the speaker is located on the second auxiliary magnets;
• wherein the first magnetic gap is formed by the first main magnet the first auxiliary magnets and the second auxiliary magnets.