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 cover fixed between the frame and the magnetic circuit system;
• the 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 cover and the magnetic circuit system enclosing a internal space of the speaker unit;
• the cover is hot pressed from polyethylene glycol terephthalate film, the bottom wall is provided with an array of first leakage holes communicating the internal space and the rear cavity, the side wall is provided with an array of second leakage holes communicating the internal space and the rear cavity.