The Onkyo SKS-HT978THX 5.1 set fills large rooms with powerful, THX-certified cinema sound. The set consists of 2 front speakers, 2 rear speakers, a center speaker, and a substantial, active, 125-watt subwoofer. Together, the speakers provide rich, detailed surround sound for movies, series, and games. The downward-facing subwoofer distributes bass tones evenly throughout the room, making them sound even livelier. Connect the speakers to a THX receiver for an intense movie theater experience without leaving the house.