... : 90W*4 @4ohm + Full Range Digital Car Amplifier 4 Channel 90W Class D Digital Car AmplifierFeatures:Compact design based on modern ... gain include under voltage, over current, voltage, temperature.All protect functions include under voltage, over current, voltage ... , temperature.Specification: Model540.4D670.3D860.5D1K2.5D480.4ABRMS Power @ ...