Speaker made of metal for 70 / 100V lines with fire protection with fireproof dome included. 6W of maximum power. 2x Low loss transformer 6W, 3W, 1,5W @ 100V and 3W, 1,5W, 0.75W @ 70V, Frequency response: 180-18500Hz +/- 10dB, Sensitivity: 98.4 dB (1W 1m), Dimensions in mm (Diameter x depth) 268 x 136 mm. Color: RAL: 9010. Protection degree IP 55 and Type B according to EN54-24. Installation drill 243mm.