MX280/4 4 Ch. Class D Full-Range Amplifier, 280 W; No matter how you like to take to the water, MX amplifiers are ready to power your soundtrack with great JL Audio sound. Engineered for versatility, MX amplifiers employ our ultra-efficient NexD™ switching technologies to generate loads of high-fidelity sound, without straining small charging systems. Housed in compact, cast-aluminum chassis, MX amps are water-resistant (IPX7 rated) and can go where conventional 12V amplifiers wouldn’t dare. Crossover filters and signal processing features are standard, allowing for easy set-up and system flexibility. Monoblock models include subwoofer level control capability using the optional M-RBC-1 (sold separately).