Designed to be used as a front end for any marine or car audio amplifier.Full featured public address system.Compatible with Wake tower speakers or other stereo speakers.Microphone and remote subwoofer level control.Equipped with in-line weatherproof connectors This universal system can be used as a front end for any marine or car audio amplifier, turning it into a full-featured public address system. Now hear this! While boating, BOSS Marine gives you the ability to be heard on the water. Already have a marine audio system? You can still add public address capabilities to your marine amplifier MR20PA Public Address System, which includes a microphone designed specifically for this application.