- 8" Weatherproof PA speaker has a 70/25 volt line transformer- 25 volt line wattage taps for 15, 10, and 3.7 watts- 70 volt line wattage taps for 15, 10, 5, 3, and 1 watts- Frequency response of 250 to 15 kHz with a sensitivity of 15 watt nom/30 watt max