Yamaha NS-777. Tweeter size: 25 mm, Woofer size: 200 mm. RMS rated power: 100 W, Peak Music Power Output (PMPO): 250 W, Frequency range: 30 - 35000 Hz. Driver cone material: Aluminium. Width: 276 mm, Depth: 390 mm, Height: 1100 mm. Type: Floor-standing speakers, Dimensions (WxDxH): 276 x 390 x 1100 mm, Satellite speaker impedance: 6 Ом