AUTOTEK AUTAYA21004 Alloy Series Class AB Amp (4 Channels, 2,100 Watts) For Porsche May Be Used As A RV May Be Used As A Handheld Flashlight 50 X 3 X 80 Mm Included with built in electronic crossovers and high level inputs 2 to 9 volt variable voltageMaximum low voltage signal from the source unit comes into the amplifier through a low voltage circuit which delivers minimal distortion through the amplification processPro Fi High Speed MOSFET components maximize power efficiency while improving sound quality and minimizing distortionQuick Thermal Dispersion Technology assures additional mass in the aluminum heat sink keeps the amplifier running cool with nearly undetectable distortions during normal music listeningHigh energy PWM (Pulse Width Modulated) power supply delivers power with minimal impact on the electrical systemRCA inputs provide the highest sound quality connection