Marine Boss AM FM iPod Bluetooth Radio, 4 Silver Boat Speakers, Amplifier, Antenna By admin in marine January 12, 2024 Preset Equalizer Selection Switch. This 4-channel waterproof MP3/iPod marine amplifier is a powerful addition to your marine audio setup. It pushes 200 watts maximum on each of the two channels for a bone-rattling power that’s basically unmatched.