Garmin® JL Audio® 4 Channel AP Amplifier. With this tough and ultracompact amplifier, you can enjoy every note from every part of your boat. Can power up to a maximum of four pairs of speakers or two pairs of speakers and one subwoofer. Built-in LCD display for manual control. Ignition protected and IP67-rated (excluding cables). Download the Garmin audio app for the easy tune feature, which streamlines amplifier setup to ensure superior sound quality and system protection.