Lanzar MXA422 Max Pro 2000-Watt 4-Channel High-Power Mosfet Amplifier 4 x 250 Watts RMS at 4 Ohms 4 x 500 Watts Max at 4 Ohms 2 x 1000 Watts Max at 4 Ohms Bridged 4 x 450 Watts at 2 Ohms RMS Electronic Crossover Network