The Yamaha YHT-4910UBL 5.1 channel AV home theater system features discrete amplifier circuit design, while Virtual Cinema Front and Extra Bass enhance the overall capabilities and performance of the system. A compact, high-gloss black 5-channel speaker package and a powerful 100W powered subwoofer are perfectly matched and work seamlessly to provide an exciting home theater experience.5-channel, 100W per channel powerful surround sound reproduction