The Rockford Fosgate PM400X4 is a premium Punch Marine Series 4-channel amplifier engineered specifically for marine, motorcycle, powersports, and off-road audio systems. Using high-output Class A/B amplifier technology, marine-grade construction, and conformal-coated circuitry, the PM400X4 is designed to deliver clean powerful sound in harsh outdoor environments while maintaining Rockford’s signature Punch Series sound quality. It’s one of the most respected compact marine 4-channel amplifiers for boats, Harleys, UTVs, and Jeep builds Main Features 400-watt 4-channel marine amplifier Class A/B amplifier topology Marine-grade conformal-coated PCB Element Ready™ outdoor durability Differential balanced inputs High-level input capable Variable high-pass and low-pass crossovers Bridgeable channel pairs Cast aluminum heatsink Stainless steel hardware UV-resistant finish Marine/powersports vibration resistance C.L.E.A.N. setup compatible Compact chassis design Specs Specification Details Amplifier Class Class A/B RMS Power @ 4Ω 50W x 4 RMS Power @ 2Ω 100W x 4 Bridged RMS Power 200W x 2 @ 4Ω Frequency Response 20Hz – 20kHz Signal-to-Noise Ratio >85 dB Crossover Type HP / LP / Full Crossover Range 50Hz – 250Hz Input Sensitivity 150mV – 12V Dimensions 11.03" x 7.76" x 2.38" Approx. Product Weight ~7 lbs Approx. Shipping Weight ~9–12 lbs
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