Elac BS 53. Woofer size: 175 mm. RMS rated power: 55 W, Peak Music Power Output (PMPO): 70 W, Frequency range: 44 - 23000 Hz. Weight: 7000 g. Type: Bookshelf, Dimensions (WxDxH): 200 x 300 x 380 mm, Audio output channels: 1.0