When youre buying an amp for marine use, you want it to do more than merely supply clean power to your speakers. You need an amp that will stand up to the rigors of the marine environment as well. Clarions APX480M 4-channel marine amplifier is built to handle the demands of off-shore life. Its circuit boards are specially-coated to resist damage from mold, mildew, and moisture, while the power, speaker, and RCA connectors are all gold-plated to impede corrosion. There are plenty of features to complement the rugged build. The MOSFET power supply ensures youll enjoy high power with low distortion. The variable high- and low-pass crossover network is adjustable from 55 to 550 Hz (55Hz-5.5kHz on channels 3 and 4), for maximum adaptability to your needs. If youre driving a pair of subs, you can dial in just the right amount of "kick" with the variable bass boost (up to 15 dB at 45 Hz). And even if your boats existing radio doesnt have preamp outputs, the APX480Ms speaker-level inputs allow easy hookup.