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This listing is for a single Kicker 45KMA300.4 4x75 Watt 4-Channel Weather-Resistant Full-Range AmplifierTOP TECHPurpose-built for your boat, every KM amp comes complete with marine-grade speaker terminals, stainless-steel screws, conformal-coated circuit boards and ABYC/NMMA-compliant power connections.FULL RANGE FUNUsing Class A/B power, this amp features a variable bass boost with KickEQTM, giving you as much as a 12dB of extra bump. A powerful 12dB crossover is also included, letting you quickly tune your system to perfection.Class A/B Power SupplyStereo Amplifier With Bridging CapabilityConformal-Coated Circuit BoardVariable 12dB CrossoverKickEQTM Variable 12dB Bass BoostABYC/NMMA-Compliant Power Connections316L Stainless-Steel Hardware IncludedSpecificationsPOWER [watts/ch], 2 OHM STEREO 75 x 4POWER [watts/ch], 4 OHM BRIDGED MONO: 150 x 2DIMS [in] 2-5/16H x 7-1/8W x ...L 12-7/16DIMS [cm] 5.9H x 18.0W x ...L 31.5FREQUENCY RESPONSE [Hz]: 10-20k, +0/-1dBINPUT SENSITIVITY: High Level 250mV-10V, Low Level 125mV-5VSIGNAL-TO-NOISE RATIO: >95dB, a-weighted, re: rated powerACTIVE CROSSOVER: 12dB/octave, variable 50-200Hz, selectable high pass, low pass or all passKickEQTM BOOST Variable to +12dB, centered @ 40HzDue to continual development, product, and specifications are subject to change without notice. Stillwater Designs and it's agents are not responsible for typographical errors.