Massive Audio Nx5 - A/B Full Range 5 Channel Amplifier 120w x 4 RMS + 800w x 1 ohm 2-Channel operation Designed to fit into restrictive or limited spaces while still delivering staggering amounts of power Ultra efficient Nano Technology power supplies and endless possible installation scenarios Built-In noise reduction circuitry Heavy duty aluminum alloy heatsink anodized in a Raven Black finish for extreme heat dissipation