Fusion Entertainment MS-AM402 Marine Amplifier 2-Ohm Stable stereo provides the option of connecting an extra pair of speakers in Parallel, 2 per channel at 2-ohms (a total of 4 speakers Marine grade connections nickel plated RCA connectors and stainless components improve signal flow for optimum output Class-ab design the 400 watt 2-ohm Stable (per channel) design ensures clean and powerful amplification of the input signal, enough to rock the boat Conformal coated circuitry provides added protection from salt Air and moisture to ensure maximum product life and marine grade chassis with stainless steel end and bottom plates provide a stunning finish coupled with environmental protection Rca line out a pass through RCA output enables linking of multiple amplifiers for enhanced System performance 2 channels capable of powering 2 speakers, a sub (bridged) or 4 speakers in Parallel