This 4″ speaker for 70/100V lines has a built-in fire protection. 9W of maximum power. Low loss transformer of 6W, 3W, 1.5W, 0.75W @100V and 3W, 1.5W, 0.75W, 0.075W@70V. Frequency response: 300-15000 Hz +/- 10dB. SPL (1W/1m, 100-10k Hz): 91 dB. Dimensions: 170x170x63 mm. Weight: 1.56 Kg. Color: RAL:9003. IP 21 protection class and Type A according to EN 54-24.