Jamo R 909. Tweeter size: 25 mm, Mid-range driver size: 140 mm, Woofer size: 380 mm. RMS rated power: 550 W, Peak Music Power Output (PMPO): 800 W, Frequency range: 35 - 30000 Hz. Weight: 63100 g. Type: Floor-standing speakers, Dimensions (WxDxH): 488 x 541 x 1276 mm, Audio output channels: 1.0