MB Quart Marine NAU460 240-Watt A/B-Class 4-Channel Amplifier MOSFET marine amplifier Micro Class A/B amplifier topology delivers 4 x 60 Watts @ 4 Ohms, 4 x 90 Watts @ 2 Ohms, 2 x 180 Watts @ 4 Ohms Designed to conform to ABYC marine electronic standards with gold-plated power, ground, speaker and RCA corrosion resistant connections High-end features such as fully adjustable crossovers including High Pass, Low Pass, Full Pass, Bass EQ and built-in diagnostics with visual indicators UV and salt water resistant paint, silk screen and heat sink enclosure; marine-grade conformal coated circuit boards resist corrosion from salt spray and moisture Features Line Outputs for daisy-chaining additional amps without the need for Y-cable adapters