Blaupunkt THA-555 PnP 5/4/3 Channel 840W Amplifier 840 Watt 5/4/3 Channel Amplifier Power at 4 ohms.: 4 x 55W + 1 x 200W RMS (4 x 110W + 1 x 400 max.) / 2 x 150W + 1 x 400W RMS (2 x 300W + 1 x 4000W max.) Power at 2 ohms. Stereo: 4 x 65W + 1 x 250W RMS (4 x 130W + 1 x 500W max.) Variable Low / High Pass Filter Features RCA, High-Level, and Direct 3.5mm Stereo Aux. Input