Miniature speaker

A miniature speaker, comprising:

• a frame providing a receiving space;
• a magnetic circuit accommodated in the receiving space, the magnetic circuit further forming a magnetic gap;
• a voice coil including a distal end suspended in the magnetic gap;
• a membrane activated by the voice coil for generating sounds;
• a plurality of contacts fixed by the frame for electrically connected to the voice coil;
• a front cover for fixing the membrane to the frame, the front cover including an outer ring and a top cover coupled with the outer ring, the top cover including a step engaging with the outer ring;
• wherein,
• the frame includes a projecting portion abutting against a top of the magnetic circuit and a slot for partially receiving the magnetic circuit;
• the magnetic circuit comprises a lower plate, a first magnet positioned on a central portion of the lower plate, a first pole plate attached on a top of the first magnet, a second magnet positioned on the lower plate separated from the first magnet, a second pole plate attached on a top of the second magnet, a third magnet positioned on the lower plate away from the second magnet, and a third pole plate attached on a top of the third magnet.