{"product_id":"sky-high-car-audio-fxb-1400-4-4-channel-amplifier","title":"Sky High Car Audio FXB 1400.4 4-Channel Amplifier","description":"\u003ch1\u003eSky High Car Audio FXB 1400.4 4-Channel Amplifier\u003c\/h1\u003e\n\n\u003cp\u003e\u003cstrong\u003eSold by AudioSellerz.com\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe Sky High Car Audio FXB 1400.4 is a compact Class D full-range amplifier built for customers who need serious speaker power without dedicating a large section of the vehicle to an amplifier rack. It delivers up to 375 watts RMS across four channels at 2 ohms while measuring only 7.01 inches long.\u003c\/p\u003e\n\n\u003cp\u003eThis makes the FXB 1400.4 a strong option for amplified door speakers, component systems, midrange drivers, pro-audio speakers, custom doors, motorcycles, powersports vehicles, factory-system upgrades and other installations where mounting space is limited.\u003c\/p\u003e\n\n\u003cp\u003eBrowse more \u003ca href=\"https:\/\/audiosellerz.com\/collections\/sky-high-car-audio\" style=\"color:#0066cc;text-decoration:underline;\"\u003eSky High Car Audio products\u003c\/a\u003e, compare our complete selection of \u003ca href=\"https:\/\/audiosellerz.com\/collections\/4-channel-amplifiers\" style=\"color:#0066cc;text-decoration:underline;\"\u003e4-channel amplifiers\u003c\/a\u003e or view \u003ca href=\"https:\/\/audiosellerz.com\/collections\/amplifiers\" style=\"color:#0066cc;text-decoration:underline;\"\u003eall car audio amplifiers\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eCompact Power for Speakers, Mids and Custom Doors\u003c\/h2\u003e\n\n\u003cp\u003eThe FXB 1400.4 provides enough output for much more than a basic factory-speaker upgrade. At 14.4 volts, it produces 200 watts RMS per channel at 4 ohms or 375 watts RMS per channel at 2 ohms.\u003c\/p\u003e\n\n\u003cp\u003eThat output can work well with higher-powered coaxial speakers, component sets, midrange drivers, midbass speakers and pro-audio systems when the speaker RMS rating, impedance and final channel load are properly matched.\u003c\/p\u003e\n\n\u003cp\u003eCustomers building a complete Sky High front stage can compare \u003ca href=\"https:\/\/audiosellerz.com\/collections\/sky-high-car-audio-speakers\" style=\"color:#0066cc;text-decoration:underline;\"\u003eSky High full-range speakers\u003c\/a\u003e, \u003ca href=\"https:\/\/audiosellerz.com\/collections\/sky-high-mid-range-speakers\" style=\"color:#0066cc;text-decoration:underline;\"\u003eSky High midrange speakers\u003c\/a\u003e, \u003ca href=\"https:\/\/audiosellerz.com\/collections\/sky-high-car-audio-midbass-speakers\" style=\"color:#0066cc;text-decoration:underline;\"\u003eSky High midbass speakers\u003c\/a\u003e and \u003ca href=\"https:\/\/audiosellerz.com\/collections\/sky-high-car-audio-tweeters\" style=\"color:#0066cc;text-decoration:underline;\"\u003eSky High tweeters\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eRMS Power Ratings at 14.4 Volts\u003c\/h2\u003e\n\n\u003ch3\u003eFour-Channel Mode\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003e375 watts RMS × 4 at 2 ohms\u003c\/li\u003e\n  \u003cli\u003e200 watts RMS × 4 at 4 ohms\u003c\/li\u003e\n  \u003cli\u003e1,500 watts RMS combined at 2 ohms\u003c\/li\u003e\n  \u003cli\u003eMinimum stereo impedance: 2 ohms per channel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTwo-Channel Bridged Mode\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003e700 watts RMS × 2 at 4 ohms\u003c\/li\u003e\n  \u003cli\u003e400 watts RMS × 2 at 8 ohms\u003c\/li\u003e\n  \u003cli\u003eMinimum bridged impedance: 4 ohms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant impedance notice:\u003c\/strong\u003e The FXB 1400.4 must not be operated below 2 ohms per channel in four-channel mode or below 4 ohms when bridged. Calculate the completed impedance of every channel before connecting the speakers.\u003c\/p\u003e\n\n\u003ch2\u003eFlexible Four-Channel or Bridged Operation\u003c\/h2\u003e\n\n\u003cp\u003eRun four independent channels for a complete front-and-rear speaker system, bridge one channel pair when part of the system needs additional power or bridge both channel pairs for a powerful two-channel configuration.\u003c\/p\u003e\n\n\u003cp\u003eThe amplifier includes selectable HPF, full-range and LP-BP crossover modes along with two-channel or four-channel input selection. These controls provide useful flexibility for several speaker layouts, but the final crossover settings should always be selected around the speakers being powered.\u003c\/p\u003e\n\n\u003ch2\u003eFXB 1400.4 Features\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCompact Class D full-range four-channel amplifier\u003c\/li\u003e\n  \u003cli\u003eFull-range frequency response from 10 Hz to 25 kHz\u003c\/li\u003e\n  \u003cli\u003eOperating-voltage range from 10 to 16 volts\u003c\/li\u003e\n  \u003cli\u003eHPF, full-range and LP-BP crossover selection\u003c\/li\u003e\n  \u003cli\u003eTwo-channel or four-channel input selection\u003c\/li\u003e\n  \u003cli\u003eMetal detent crossover adjustment controls\u003c\/li\u003e\n  \u003cli\u003eTiffany-style RCA connections\u003c\/li\u003e\n  \u003cli\u003eReversible Sky High emblem for different mounting positions\u003c\/li\u003e\n  \u003cli\u003ePower, clipping and protection indicators\u003c\/li\u003e\n  \u003cli\u003eFanless design\u003c\/li\u003e\n  \u003cli\u003e85% rated efficiency at full power\u003c\/li\u003e\n  \u003cli\u003e95 dB signal-to-noise ratio\u003c\/li\u003e\n  \u003cli\u003e180 damping factor\u003c\/li\u003e\n  \u003cli\u003eLess than 0.1% total harmonic distortion\u003c\/li\u003e\n  \u003cli\u003eThermal, overload, DC-output, short-circuit and input-voltage protection\u003c\/li\u003e\n  \u003cli\u003e4-gauge power and ground terminals\u003c\/li\u003e\n  \u003cli\u003e10-gauge speaker-output terminals\u003c\/li\u003e\n  \u003cli\u003e150-amp fuse rating\u003c\/li\u003e\n  \u003cli\u003eCompatible with the SHCA modular mounting ecosystem\u003c\/li\u003e\n  \u003cli\u003eCompatible with SHCA Universal Amp Key mounting options\u003c\/li\u003e\n  \u003cli\u003eOne-year manufacturer defect warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompact Dimensions\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eWidth: 5.9 inches\u003c\/li\u003e\n  \u003cli\u003eLength: 7.01 inches\u003c\/li\u003e\n  \u003cli\u003eHeight: 2.1 inches\u003c\/li\u003e\n  \u003cli\u003eQuantity: One amplifier\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eMeasure the intended mounting location before ordering and leave additional room for power wire, speaker wire, RCA cables, adjustment access and ventilation. Because the amplifier uses a fanless design, it should not be sealed inside an unventilated compartment or mounted where heat cannot escape.\u003c\/p\u003e\n\n\u003cp\u003eAlthough the compact size makes it useful for motorcycle and powersports installations, the product is not identified as waterproof or marine-rated. Install it where it will remain protected from water and direct moisture.\u003c\/p\u003e\n\n\u003ch2\u003ePlan the Wiring and Electrical Support\u003c\/h2\u003e\n\n\u003cp\u003eThe FXB 1400.4 uses 4-gauge power terminals and carries a 150-amp fuse rating. Power and ground wire should be selected around the conductor material, cable length, expected current demand and complete system—not terminal size alone.\u003c\/p\u003e\n\n\u003cp\u003eBrowse compatible \u003ca href=\"https:\/\/audiosellerz.com\/collections\/amp-kits\" style=\"color:#0066cc;text-decoration:underline;\"\u003ecar audio amplifier wiring kits\u003c\/a\u003e and \u003ca href=\"https:\/\/audiosellerz.com\/collections\/power-speaker-wire\" style=\"color:#0066cc;text-decoration:underline;\"\u003epower, ground and speaker wire\u003c\/a\u003e. Use properly sized fuse protection near the power source and keep the amplifier ground short, secure and connected to clean bare metal.\u003c\/p\u003e\n\n\u003cp\u003eIf the factory radio is staying in the vehicle, confirm whether the system needs a line-output converter, DSP or another integration solution before beginning the installation.\u003c\/p\u003e\n\n\u003ch2\u003eSpeaker Matching and Tuning\u003c\/h2\u003e\n\n\u003cp\u003eDo not choose speakers only by their advertised peak-power rating. Match the FXB 1400.4 to the speakers using RMS power, individual speaker impedance, quantity per channel, wiring configuration and the amplifier’s output at the completed load.\u003c\/p\u003e\n\n\u003cp\u003eSet the gain using a clean signal and treat it as an input-sensitivity adjustment—not a volume control. Use appropriate high-pass crossover protection for door speakers, coaxial speakers, mids and tweeters. Our \u003ca href=\"https:\/\/audiosellerz.com\/blogs\/audio-sellerz-blogs\/car-audio-speaker-tuning-guide\" style=\"color:#0066cc;text-decoration:underline;\"\u003ecar audio speaker tuning guide\u003c\/a\u003e explains gain, crossover and speaker-system setup in more detail.\u003c\/p\u003e\n\n\u003ch2\u003eWho Should Choose the FXB 1400.4?\u003c\/h2\u003e\n\n\u003cp\u003eThe Sky High FXB 1400.4 makes the most sense when you need strong four-channel output, bridgeable flexibility and a compact mounting footprint. It is especially useful for custom doors, high-output mids and highs, motorcycles, powersports vehicles, under-seat installations and modern vehicles with limited amplifier space.\u003c\/p\u003e\n\n\u003cp\u003eIf your speakers need less power or the installation area is even smaller, compare the other compact FXB amplifiers before deciding. If your speaker system requires more than 375 watts RMS per channel at 2 ohms, move up to a larger amplifier instead of forcing this model to operate below its minimum impedance.\u003c\/p\u003e\n\n\u003ch2\u003eConnect With Audio Sellerz\u003c\/h2\u003e\n\n\u003cp\u003eFollow Audio Sellerz on \u003ca href=\"https:\/\/www.facebook.com\/share\/1BTSynboiR\/\" style=\"color:#0066cc;text-decoration:underline;\" rel=\"noopener\" target=\"_blank\"\u003eFacebook\u003c\/a\u003e, \u003ca href=\"https:\/\/www.instagram.com\/audiosellerz\" style=\"color:#0066cc;text-decoration:underline;\" rel=\"noopener\" target=\"_blank\"\u003eInstagram\u003c\/a\u003e, \u003ca href=\"https:\/\/www.tiktok.com\/@audiosellerz\" style=\"color:#0066cc;text-decoration:underline;\" rel=\"noopener\" target=\"_blank\"\u003eTikTok\u003c\/a\u003e and \u003ca href=\"https:\/\/youtube.com\/@audiosellerz\" style=\"color:#0066cc;text-decoration:underline;\" rel=\"noopener\" target=\"_blank\"\u003eYouTube\u003c\/a\u003e.\u003c\/p\u003e","brand":"Sky High Car Audio","offers":[{"title":"Default Title","offer_id":61864088666252,"sku":"SHCA-FXB-1400-4","price":244.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/5076\/8524\/files\/SHCA-FXB-1400-4.3__57674.webp?v=1790790546","url":"https:\/\/audiosellerz.com\/products\/sky-high-car-audio-fxb-1400-4-4-channel-amplifier","provider":"Audio Sellerz","version":"1.0","type":"link"}