Sony SRS-D4. RMS rated power: 27 W. Connectivity technology: Wired, Speaker interface type: 3.5 mm. Weight: 1.7 kg. Audio output channels: 2.1, Subwoofer dimensions (WxHxD): 200 x 213 x 196 mm, Surround speaker dimensions (WxHxD): 94 x 119 x 176 mm