Orion CB2500.1D Cobalt Series Monoblock Class D 1-Ohm Amplifier Power rating: RMS @ 4 ohm 14.4 Volt: 425 W x 1 / RMS @ 2 ohm 14.4 Volt: 860 W x 1 / RMS @ 1 ohm 14.4 Volt: 12500 W x 1 Max power: 5000W Frequency response: 10Hz - 400kHz (-3Db) Impedance: 22K ohm sensitivity: 150Mv - 5V