Logitech X-540, 5.1 surround-sound. RMS rated power: 70 W, Peak Music Power Output (PMPO): 140 W, Frequency range: 40 - 20 Hz. Connectivity technology: Wired. Dimensions (WxDxH): 121 x 95 x 198 mm, Audio output channels: 5.1, Subwoofer dimensions (WxHxD): 165 x 248 x 286 mm