Visaton DL 18/2 SQ. Driver size: 165.1 mm (6.5 "). RMS rated power: 40 W, Peak Music Power Output (PMPO): 60 W, Frequency range: 70 – 20000 Hz. Diameter: 170 mm, Weight: 0.864 kg. AC adapter output voltage: 100 V. Operating temperature range (T-T): -25 - 70 °C