The Rockford Fosgate M2-500X1 is a premium Element Ready marine/powersports mono amplifier designed specifically for subwoofer applications in boats, motorcycles, UTVs, and other harsh-environment installs. The biggest strengths are its marine-grade durability, clean 500W RMS output, and compact efficient Class-D design. Key Features Mono Class-D amplifier 500W RMS @ 2Ω 300W RMS @ 4Ω Element Ready™ chassis Conformal-coated PCB boards UV-stable powder-coated heatsink Zinc nickel-plated marine-grade terminals C.L.E.A.N. gain setup system Punch EQ bass boost Wired bass remote included Differential-balanced inputs High-level & RCA inputs Auto turn-on capability MEHSA4 thermal management system Performance Specifications RMS Power: 300W ×1 @ 4Ω 500W ×1 @ 2Ω Frequency Response: 20Hz–250Hz Low-pass filter: 50–250Hz Subsonic filter: 15–40Hz Punch EQ: Up to 18dB @ 45Hz Recommended power wire: 4 gauge Dimensions: 8.5" W 7.75" D 1.9" H