Speaker box

A speaker box comprising:

• a housing and a speaker unit housed in the housing, the speaker unit and the housing form the rear cavity of the speaker box, the rear cavity is filled with sound-absorbing powder;
• wherein, the speaker unit comprises a frame, a vibration system and a magnetic circuit system respectively fixed to the frame, and a metal cover fixed between the frame and the magnetic circuit system;
• the metal cover comprises a bottom wall set at a bottom of the speaker unit and a side wall extending from the bottom wall and set at a side of the speaker unit;
• the vibration system, the frame, the metal cover and the magnetic circuit system enclosing a internal space of the speaker unit;
• the bottom wall and/or the side wall are provided with leak structures formed by stamping communicating the internal space and the rear cavity, the leak structure comprising a bar-shaped through-hole and a bar-shaped bulge corresponding to the bar-shaped through-hole.