Kicker KMA360.4 4x90w 4-Ch Weather-Resistant Full-Range Amplifier - 48KMA3604 Get KMA Marine Amplifier power on the water! These super-flexible marine amps are perfect for your boat and your wallet. Purpose-built for your boat, every KMA amp is pure KICKER Real Marine, complete with marine-grade speaker terminals, stainless-steel screws, conformal-coated circuit boards and ABYC/NMMA-compliant power connections. The amplifiers are also equipped with KickEQ variable bass boost. Features - Conformal-Coated Circuit Boards to Repel Moisture 316L Stainless-Steel, No-Rust Hardware Small Footprint to Tuck Out of the Way Marine-Compliant Terminals 0-6dB Variable Bass Boost Built-In Variable Crossovers for Precise Speaker Performance Matching Adds Extra Intensity to a Large System Marine Environment Ready Superior Sound Quality and Added Power Specifications - Power [watts/ch] 2 Ohm Stereo: 90x4 Power [watts/ch] 4 Ohm Stereo: 65x4 Power [watts/ch] 4 Ohm Bridged Mono: 180x2 Dynamic Power [watts]: 500 Frequency Response [Hz]: 10-20k Crossover: OFF/HP/LP; variable 50-200Hz, 12dB/octave KickEQ+ Bass Boost: All Models Variable 0-6dB @ 40Hz Dimensions [in, cm]: H – 2-5/16, 5.9; W – 6-11/16, 17; L - 12-7/16, 31.5