Rated power : 20W / 40W / 40W / 60W3-inch (20W) / 4.5-inch (40W) / 6-inch (40W) / 8-inch (60W)Frequency response : 80-20KHz / 60-20KHz / 75-20KHz / 70-20KHzConstant voltage with waterproof connectorSensitivity : 90dB / 89dB / 91dB / 92dBMaterial :...