Bose Acoustimass 10 Speakers. Audio output channels: 5.1. Center speaker dimensions (WxDxH): 157 x 102 x 78 mm, Center speaker weight: 1.1 kg, Subwoofer dimensions (WxDxH): 206 x 414 x 643 mm. Surround speaker dimensions (WxHxD): 79 x 157 x 102 mm, Surround speaker weight: 1.1 kg