Soundstream REF5.1000 4-Amplifier  Channel Regulated MOSFET power supply RUBI (Rapid-use branched impulse) proprietary power supply technology STACT (stabilized apex current technology) reduces power supply stress by 50% Power output: 95 Watts RMS x 4 & 270 x 1 @ 4 ohms, 135 Watts RMS x 4 & 460 x 1 @ 2 ohms, 270 Watts RMS x 2 @ 1 Ohm Auto high-current, regulates power supply load for application