{"product_id":"mrdf-4","title":"MRDF-4","description":"\u003cp\u003eGive your boat speakers dedicated power without giving up much installation space. The Rockville MRDF-4 is a compact four-channel marine amplifier that delivers 175W RMS per channel at 2 ohms, for 700W RMS total. At 4 ohms, it supplies 115W RMS per channel, or 350W RMS per channel when configured as two bridged channels.\u003c\/p\u003e\n\u003cp\u003eA conformal-coated circuit board helps protect the electronics from moisture and salt air. Stainless steel hardware, an aluminum-alloy heat sink, and a UV- and salt-resistant chassis suit marine installations. Included white silicone terminal covers help shield the power, ground, remote, and RCA connections from splashes and corrosion.\u003c\/p\u003e\n\u003cp\u003eFull-range, high-pass, and low-pass modes let you configure the amplifier for your speaker setup. Adjustable filters from 50Hz to 250Hz help shape the frequencies sent to full-range speakers, component speakers, or compatible bridged subwoofers. Tiffany-style RCA inputs provide the signal connection, while power, status-mode, and clipping indicators make operating conditions easier to monitor.\u003c\/p\u003e\n\u003cp\u003eThe Class D design uses SMD components and a high-speed MOSFET power supply, with rated efficiency of 76% at 2 ohms and 85% at 4 ohms. Its 10.43-inch-long chassis fits into smaller installation spaces; check available clearance for the amplifier, wiring, and terminal covers before mounting. Thermal, short-circuit, and over-voltage protection provide safeguards against operating faults.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eType: four-channel Class D marine amplifier\u003c\/li\u003e\n\u003cli\u003eDyno-certified continuous output at 2 ohms stereo: 175W RMS x 4; 700W RMS total\u003c\/li\u003e\n\u003cli\u003eContinuous output at 4 ohms stereo: 115W RMS x 4\u003c\/li\u003e\n\u003cli\u003eContinuous output at 4 ohms bridged: 350W RMS x 2\u003c\/li\u003e\n\u003cli\u003eRMS power test conditions: 1kHz, 1% THD+N, 14.4 VDC\u003c\/li\u003e\n\u003cli\u003eRated efficiency: 76% at 2 ohms stereo and 4 ohms bridged; 85% at 4 ohms stereo\u003c\/li\u003e\n\u003cli\u003ePeak output: 700W x 4 at 2 ohms; 460W x 4 at 4 ohms; 2,800W system peak\u003c\/li\u003e\n\u003cli\u003eFrequency response: 5Hz–45kHz (±3 dB)\u003c\/li\u003e\n\u003cli\u003eDistortion: under 0.03% THD+N at 1W RMS, 20Hz–20kHz\u003c\/li\u003e\n\u003cli\u003eSignal-to-noise ratio: 73 dBA, referenced to 1W RMS into 4 ohms\u003c\/li\u003e\n\u003cli\u003eStereo separation: -56 dB at 5kHz\u003c\/li\u003e\n\u003cli\u003eDamping factor: 64.88\u003c\/li\u003e\n\u003cli\u003eInput sensitivity: 224 mVrms–6.00 Vrms\u003c\/li\u003e\n\u003cli\u003eCrossover modes: full range, low pass, and high pass\u003c\/li\u003e\n\u003cli\u003eAdjustable low-pass and high-pass filter range: 50Hz–250Hz\u003c\/li\u003e\n\u003cli\u003eOperating voltage: 9–16.1 VDC\u003c\/li\u003e\n\u003cli\u003eIdle current draw: 1A\u003c\/li\u003e\n\u003cli\u003eFuse rating: 80A total, with four 20A internal fuses\u003c\/li\u003e\n\u003cli\u003ePower and ground terminals: 4 AWG\u003c\/li\u003e\n\u003cli\u003eSpeaker outputs: 10 AWG\u003c\/li\u003e\n\u003cli\u003ePower supply: high-speed MOSFET\u003c\/li\u003e\n\u003cli\u003eProtection: thermal, short circuit, and over voltage\u003c\/li\u003e\n\u003cli\u003eDimensions (L x W x H): 10.43 x 4.92 x 1.81 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eIn the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMRDF-4 marine amplifier\u003c\/li\u003e\n\u003cli\u003eWhite silicone terminal covers\u003c\/li\u003e\n\u003cli\u003eMounting hardware\u003c\/li\u003e\n\u003cli\u003eOwner’s manual\u003c\/li\u003e\n\u003cli\u003eSpare fuses\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rockville","offers":[{"title":"Default Title","offer_id":51586821030055,"sku":"MRDF-4","price":129.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/7998\/6599\/files\/3051981.jpg?v=1792615571","url":"https:\/\/rockvilleaudio.com\/products\/mrdf-4","provider":"Rockville","version":"1.0","type":"link"}