Sound device

A sound device comprising:

• a frame having a receiving space;
• a magnet system having a first magnetic gap and a second magnetic gap interconnected with each other, comprising:
• a first inner yoke;
• a main magnet fixed to the first inner yoke;
• and
• a second inner yoke fixed to one side of the main magnet away from the first inner yoke;
• a first vibration system arranged on one side of the magnet system, comprising:
• a first diaphragm fixed to the frame;
• a rectangular first coil inserted into the first magnetic gap and surrounding the main magnet and the second inner yoke;
• and
• a first FPC electrically connected with the first coil;
• a second vibration system arranged on the other side of the magnet system, comprising:
• a second diaphragm fixed to the frame;
• and
• a second coil inserted into the second magnetic gap and malposed with the first coil;
• wherein
• the first coil comprises a first corner portion located in corner position;
• the first FPC comprises a first fixation portion fixed to the frame, a first welding portion welded to the first coil, and a first elastic portion connecting the first fixation portion with the first welding portion;
• the first elastic portion is spaced apart from the first coil;
• the first welding portion is located on one side of the first corner portion away from the second inner yoke.