4" speaker manufactured in metal for 70 / 100V lines with fire protection. 9W of maximum 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: RAL9003.