The Bose Acoustimass 15 is a home theater speaker system that includes a set of five small satellite speakers and a powered subwoofer. The satellite speakers are designed to be wall-mounted or placed on speaker stands, and they are meant to provide clear and immersive sound for movies, music, and other audio content. The Acoustimass 15 system uses Bose's proprietary Direct/Reflecting speaker technology to deliver a spacious soundstage. The powered subwoofer is responsible for producing deep, room-shaking bass. The system is typically used with a compatible AV receiver or amplifier to power and control the speakers.