DESC: Enjoy studio-quality sound with the Z-5500 Digital Speaker System from Logitech®. This THX®-certified 500 Watt speaker system gives you 5.1 surround sound for clear and crisp sound. It features a large, 10" long-throw subwoofer driver with flared bass port that delivers 188 watts of thunderous bass. With digital equalization, this speaker system actively adjusts frequency response in real time for clean and accurate sound reproduction.