4-Channel Full-Range Marine Amplifier with electronic Crossover, variable Bass bosst and preamp outputs.The MA6004's high-output MOSFET power supply ensures optimum power delivery into numerous impedances with low distortion. The MA6004 comes outfitted with a variable 12dB per octave electronic crossover allowing you to optimize system tuning based on speaker location and accompanying loudspeaker components. Full range preamp outputs are provided facilitating multiple amplifier hookups without the need for high-loss Y-adapters or signal splitters.