Precision Power A1000.4 1000W Atom Series Class D 4-Channel Car Amplifier RMS Power Rating: 4 ohms: 90 watts x 4 chan./2 ohms: 125 watts x 4 chan./Bridged, 4 ohms: 250 watts x 2 chan. Pulse Width Modulated MOSFET power supply Military Grade SMT PCB Maintains Dynamic Performance LED power (green) and protect (red) indicators Speaker-level (high-level) inputs with signal sensing for automatic turn-on