Power amplifiers from Boss Audio are marinized with conformal coated boards. The Boss Audio MR1200PA Marine Power Amplifier With Built-In PA System is designed to enhance the sound of your speakers so you receive the most from your music while on the water. Bridgeable MOSFET marine amplifier. Built-in public address system with microphone. In-line weatherproof connectors. Boss Audio MR1200PA amplifier features 300 watts x 4 output; 600 watts x 2 bridged output.