The Rockford Fosgate M2-300X4 is one of the best compact marine and powersports 4-channel amplifiers for customers wanting clean sound quality, marine durability, and efficient power output without moving into the much more expensive Power Marine lineup. Key Features 4-channel Class-D amplifier Element Ready™ marine protection C.L.E.A.N. gain setup system Differential-balanced inputs High-level input compatibility Auto turn-on capability UV-stable powder-coated heatsink Zinc nickel-plated marine-grade terminals Conformal-coated PCB boards Variable high-pass & low-pass crossovers Compact footprint for tight installs Power Ratings 50W RMS × 4 @ 4Ω 75W RMS × 4 @ 2Ω 150W RMS × 2 bridged @ 4Ω This makes it ideal for: Four 6.5" marine speakers Motorcycle fairing speakers Wake tower speakers Harley bagger speaker upgrades Compact marine systems Performance Specifications Frequency Response: 20Hz–20kHz Crossover Range: 50Hz–250Hz Amplifier Topology: Class-D Recommended Power Wire: 4 gauge Fuse Rating: 60A Dimensions: Approx. 10.1" W 6.8" D 1.9" H