Rockford R300X4 Prime 4-Channel Amplifier 50 Watts x 4 @ 4-Ohm / 75 Watts x 4 @ 2-Ohm / 150 Watts x 2 @ 4-Ohm Bridged Accepts High Level & RCA Level Input Cast aluminum heatsink with Top Mount Controls 12dB/octave crossover Class A/B Circuit Topology