4'' speaker made of metal for 70 / 100V lines with fire protection. 9W of max power. Low loss transformer 6/3 / 1.5 / 0.75 W @ 100V, 3 / 1.5 / 0.75 / 0.25 W @ 70V, Frequency response: 300-15000Hz +/- 5dB. Sensitivity: 91 dB (1m / 1W / Khz), Dimensions in mm (Length x width x depth) 170 x 170 x 63. Color: RAL 9003. Degree of protection IP 21 and Type A according to EN54-24.