Trust 5.1 Surround Speaker Set SP-6400M, 5.1 channels, 18 W, 180 x 190 x 180 mm, 59 x 180 x 170 mm Trust 5.1 Surround Speaker Set SP-6400M. Audio output channels: 5.1 channels. Subwoofer RMS power: 18 W, Subwoofer dimensions (WxDxH): 180 x 190 x 180 mm. Dimensions (WxDxH): 59 x 180 x 170 mm