Magnat Quantum 603. Tweeter size: 25 mm, Mid-range driver size: 170 mm. Frequency range: 30 - 55000 Hz, Impedance: 4 Ом, Sensitivity: 91 dB. Weight: 7700 g. Type: Floor-standing speakers, Dimensions (WxDxH): 195 x 300 x 365 mm, Audio output channels: 2.0