Yamaha NS-50F. Tweeter size: 30 mm, Woofer size: 160 mm. RMS rated power: 80 W, Peak Music Power Output (PMPO): 240 W, Frequency range: 35 - 35000 Hz. Width: 233 mm, Depth: 271 mm, Height: 880 mm. Type: Floor-standing speakers, Dimensions (WxDxH): 233 x 271 x 880 mm, Satellite speaker impedance: 6 Ом