Cyber Acoustics CA-4400 E 5-Piece Amplified Speaker System 5-piece surround sound speaker system with 4 satellite speakers and subwoofer Ideal for PC and Mac games, but also appropriate for movies and music 2.5-inch high-/mid-range satellite drivers and 4-inch subwoofer driver Master volume and rear volume controls located on right front satellite 30 watts nominal RMS output power; 1-year warranty