{"product_id":"mb-quart-na3-560-4-4-channel-marine-amplifier","title":"MB Quart NA3-560.4 4-Channel Marine Amplifier","description":"\u003cp\u003eThe MB Quart NA3-560.4 is a four-channel marine amplifier designed to add clean, configurable power to boat, powersports, and weather-exposed audio systems. It delivers up to 70 watts RMS per channel at 4 ohms or 140 watts RMS per channel at 2 ohms. This makes it suitable for powering four full-range marine speakers from a compatible source unit.\u003c\/p\u003e\u003cp\u003eIts four-channel layout gives installers flexibility for balanced multi-speaker systems, including front-and-rear zone arrangements. Each channel pair can also be bridged, allowing the amplifier to provide up to 280 watts RMS per bridged pair at 4 ohms. The result is a practical option for systems that may evolve from four speakers to a mixed speaker-and-subwoofer configuration.\u003c\/p\u003e\u003cp\u003eThe NA3-560.4 uses MB Quart's Class SQ Class A\/B topology, Q-Stasis preamplifier section, and FLUID-FET output devices. Its published frequency response extends from 10 Hz to 45 kHz, with a signal-to-noise ratio above 90 dB and total harmonic distortion below 0.2%. Adjustable gain, crossover, and bass-boost controls allow the amplifier to be matched to the speakers and source unit in the system.\u003c\/p\u003e\u003cp\u003eFor marine-duty use, the amplifier is IPX67 rated and uses a conformal-coated circuit board, sealed connections, and corrosion-resistant stainless-steel hardware. A gloss-white epoxy finish and heavy-duty heat sink help transfer heat away from the amplifier's output stage. The top-mounted controls are protected by a removable sealed cover.\u003c\/p\u003e\u003cp\u003eRCA inputs support conventional preamp-level source connections, while speaker-level input capability and DC signal sensing support installations using source units without RCA outputs. The amplifier can be switched between remote turn-on and DC-sense activation modes. It is a focused power-amplifier upgrade, so a compatible source unit, speakers, power wiring, ground connection, and correctly sized fuse are still required.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-Channel Output:\u003c\/strong\u003e Powers up to four speakers from one compact amplifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-Ohm Power:\u003c\/strong\u003e Delivers 140 watts RMS per channel at 2 ohms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBridgeable Channel Pairs:\u003c\/strong\u003e Supports two 280-watt RMS bridged channels at 4 ohms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIPX67 Marine Protection:\u003c\/strong\u003e Built for water- and dust-resistant marine installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable Crossovers:\u003c\/strong\u003e Helps route appropriate frequencies to speakers or subwoofers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC Signal Sensing:\u003c\/strong\u003e Supports turn-on with compatible speaker-level source signals.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDesign \u0026amp; Installation\u003c\/h3\u003e\u003cp\u003eThe NA3-560.4 combines a gloss-white epoxy exterior, heavy-duty heat sink, conformal-coated circuit board, sealed connection points, and stainless-steel hardware for marine-oriented durability. Its top-mounted tuning controls sit beneath a removable cover that should be reinstalled after adjustment. The amplifier also includes illuminated status indicators for overload and speaker-short protection monitoring.\u003c\/p\u003e\u003cp\u003eMount the amplifier securely in a location with adequate ventilation and do not mount it upside down. Use high-quality 10 AWG copper power and ground cable, install a 35-amp fuse within 18 inches of the battery connection, and use the included harnesses for power and speaker connections. Set gain as a signal-matching control rather than as a volume control, then select full-range, high-pass, or low-pass crossover operation for the connected speakers.\u003c\/p\u003e","brand":"MB Quart","offers":[{"title":"Default Title","offer_id":45633162248262,"sku":"NA3-560-4","price":259.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0048\/4163\/5910\/files\/51LWiCEJg9L.jpg?v=1784407312","url":"https:\/\/audiowatt.store\/products\/mb-quart-na3-560-4-4-channel-marine-amplifier","provider":"Audio Watt Store","version":"1.0","type":"link"}