Dolby digital plus, Dolby True HD. 5.1ch surround sound system. 3 HDMI inputs for multiple device connection. HDMI lead included. Upscales to 1080p. 1000 watts. 285 watt subwoofer. 143 watt centre speaker. 4 satellite speakers, each 143 watts. Built in radio tuner. Active amp. Built in Dolby Pro Logic II decoder. Dolby digital. DTS surround sound. Optical audio connection. Separate remote control included. Remote control requires 2 x AA batteries (included). Size of subwoofer (H)39.5, (W)22, (D)32.5cm. Size of centre speaker (H)5, (W)38, (D)6.4cm. Size of satellite speaker (H)16.3, (W)10.2, (D)7.7cm.