Provided is an enclosure including a rear chamber, a speaker unit chamber disposed adjacent to the rear chamber and connected to the rear chamber such that air flows between the speaker unit chamber and the rear chamber, a front chamber disposed adjacent to the speaker unit chamber and connected to the speaker unit chamber such that air flows between the speaker unit chamber and the front chamber, and a duct having a first side connected to the front chamber such that air flows between the front chamber and the duct and a second side opened to the outside, wherein the rear chamber, the speaker unit chamber, the front chamber, and the duct are disposed between a first plate and a second plate that are spaced apart from each other.