{"product_id":"mb-quart-ra1-280-4-reference-4-channel-amplifier","title":"MB Quart RA1-280.4 Reference 4-Channel Amplifier","description":"\u003cp\u003eThe MB Quart RA1-280.4 is a compact four-channel car amplifier for powering front and rear speakers from an aftermarket or factory-based audio system. Its four-channel layout makes it suited to common full-range speaker upgrades where a head unit alone does not provide enough clean output. It is designed for universal vehicle applications and supports 2- or 4-channel operation.\u003c\/p\u003e\u003cp\u003eRated at 50 watts per channel into 4 ohms and 70 watts per channel into 2 ohms, the RA1-280.4 is intended for efficient power delivery to compatible full-range speakers. This makes it a practical match for many door-speaker, component-speaker, and coaxial-speaker installations. Independent crossover sections help tailor the signal for the speakers being used.\u003c\/p\u003e\u003cp\u003eThe amplifier uses MB Quart's Class SQ Class D topology, combining compact Class D efficiency with a four-channel configuration. A Q-Stasis low-noise preamplifier stage and FLUID-FETS output-device technology are part of its signal and output design. The specified signal-to-noise ratio is greater than 101 dB, with total harmonic distortion rated below 0.09%.\u003c\/p\u003e\u003cp\u003eVariable high-pass and low-pass crossover controls are provided for channels 1 and 2 as well as channels 3 and 4. Each channel pair can be set to full-range, high-pass, or low-pass operation, with a 50 to 250 Hz adjustment range. A 0 to 9 dB bass-boost control provides an additional low-frequency adjustment when appropriate for the system.\u003c\/p\u003e\u003cp\u003eFor factory-audio integration, the RA1-280.4 includes DC Signal Sense auto turn-on capability. This feature can allow the amplifier to power on when it receives a signal, reducing the need for a separate remote turn-on lead in applicable installations. It uses RCA inputs and is intended to be installed with properly sized power, ground, speaker, and signal wiring.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-Channel Configuration:\u003c\/strong\u003e Powers up to four compatible full-range speaker channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass SQ Class D Design:\u003c\/strong\u003e Provides efficient multi-channel amplification in a compact chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50\/70-Watt Channel Ratings:\u003c\/strong\u003e Delivers 50 watts at 4 ohms or 70 watts at 2 ohms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable Electronic Crossovers:\u003c\/strong\u003e Lets each channel pair run full-range, high-pass, or low-pass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC Signal Sense:\u003c\/strong\u003e Supports automatic turn-on from an incoming signal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0-9 dB Bass Boost:\u003c\/strong\u003e Adds adjustable low-frequency output control when needed.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDesign \u0026amp; Installation\u003c\/h3\u003e\u003cp\u003eThe RA1-280.4 uses an aluminum heat sink to dissipate heat and heavy-duty connection hardware for power, ground, and speaker wiring. Its power supply is a MOSFET pulse-width-modulation design, while nickel-plated RCA inputs are designed for secure signal connections. The black amplifier chassis measures 11.0 inches long, 6.0 inches wide, and 2.25 inches high.\u003c\/p\u003e\u003cp\u003eInstall the amplifier on a secure surface with adequate ventilation and do not mount it upside down. MB Quart specifies 4 AWG power and ground cable requirements and accepts up to 12 AWG speaker wire at the terminals; the amplifier uses a 40A external fuse. Set each channel pair's crossover mode and 50-250 Hz crossover point to suit the connected speakers, and use compatible 2- or 4-ohm speaker loads.\u003c\/p\u003e","brand":"MB Quart","offers":[{"title":"Default Title","offer_id":45633162772550,"sku":"RA1280-4","price":228.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0048\/4163\/5910\/files\/51p_whjCOwL.jpg?v=1784407442","url":"https:\/\/audiowatt.store\/products\/mb-quart-ra1-280-4-reference-4-channel-amplifier","provider":"Audio Watt Store","version":"1.0","type":"link"}