Bose Acoustimass 15 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 739 mm. Package weight: 33 kg. Surround speaker dimensions (WxHxD): 78 x 157 x 102 mm, Surround speaker weight: 1.1 kg