With 4 channels and a 500 Watt peak power output, the MS-AM504 will power either a pair of Fusion speakers plus a 10” subwoofer, or up to four pairs of speakers (with 2 speakers in parallel each channel at 2 Ohms), to spread the sound around your vessel. Incorporating heat-tempered and conformal coated PCBs for maximum product life, and gold-plated connectors for improved signal flow, the MS-AM504 reproduces clean and powerful audio with enough power to rock the boat.