JL Audio MX280/4 Marine and Powersports Amplifier 4 Channel
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JL Audio MX280/4 Compact Marine & Powersports 4-Channel Amplifier
Massive Audiophile Power. Microscopic Footprint.
Don't let the small size fool you. The JL Audio MX280/4 is a rugged, ultra-compact 4-channel Class-D amplifier engineered specifically to pack massive audio output into tight, limited-space applications. Perfect for center consoles, jet skis, small boats, side-by-sides, and off-road 4WD setups, this powerhouse delivers crystal-clear sound that easily slices through the roar of wind, waves, and mud tires.
Measuring just 220 mm wide and 45 mm high, it tucks neatly into dashes, glove boxes, or custom tight spaces where standard amplifiers could never dream of fitting.
The NexD™ Efficiency Advantage
Traditional high-power amplifiers create immense heat and place severe strain on your vehicle or boat's electrical charging systems. JL Audio solves this with their proprietary NexD™ high-speed switching technology. This ultra-efficient Class-D architecture squeezes every ounce of performance out of your 12-volt setup, minimizing heat generation and current draw while maintaining immaculate, high-fidelity sound.
Key Features & Benefits
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Extreme IPX7 Waterproof Construction: Completely sealed against the elements. The MX280/4 doesn’t just withstand splashes—its cast-aluminum chassis is rated to handle temporary water immersion up to 1 meter.
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Fully Bridgeable Architecture: Ultimate system flexibility. Run it as a standard 4-channel setup (50W x 4) for your main cockpit speakers, bridge it to 2 channels (140W x 2) to blast heavy-duty tower speakers, or configure it as a 3-channel amp to run a pair of coaxes alongside a dedicated marine subwoofer.
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Dual-Range Differential Inputs: Equipped with smart inputs that accept both line-level (RCA) and high-power speaker-level signals. The differential-balanced design actively rejects electrical interference, completely eliminating annoying alternator whine and background hum.
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Protected Onboard Controls: A water-resistant gasketed aluminum security plate conceals independent front and rear variable crossover filters (selectable full-range, high-pass, or low-pass), ensuring your tuning controls stay bone-dry and safe from corrosion.
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Built for Saltwater Life: Coated in a durable, sleek black powder-coated finish and paired exclusively with marine-grade stainless steel hardware to prevent rust over years of heavy marine usage.
Power Output Specifications
| Load Configuration | RMS Power @ 14.4V | RMS Power @ 12.5V |
| 4 $\Omega$ Stereo (Per Channel) | 50 Watts RMS x 4 | 36 Watts RMS x 4 |
| 2 $\Omega$ Stereo (Per Channel) | 70 Watts RMS x 4 | 52 Watts RMS x 4 |
| 4 $\Omega$ Bridged (Mono Pairs) | 140 Watts RMS x 2 | 100 Watts RMS x 2 |
Technical Specifications
| Feature | Specification |
| Amplifier Class | Ultra-efficient NexD™ Class D |
| Waterproof Rating | IPX7 (Submersible up to 1 meter) |
| Frequency Response | 20 Hz - 20 kHz (+0, -1dB) |
| Signal-to-Noise Ratio | >89.5 dB (A-weighted, referred to highest rated power) |
| Crossover Filter Modes | High-Pass or Low-Pass (Defeated via switch) |
| Filter Range / Slope | Variable 35 Hz - 300 Hz / 12 dB/octave |
| Minimum Power/GND Wire | 8 AWG copper wire |
| Fuse Rating | 35 Amp (AFS, AGU, or MaxiFuse™) |
| Dimensions (W x H x D) | 220 mm x 45 mm x 78.5 mm (8.66" x 1.77" x 3.09") |
| Net Weight | 1.44 kg (3.18 lbs) |
What's In The Box?
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(1) MX280/4 4-Channel Marine Amplifier
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Integrated 12-inch Power and Signal Wiring Harness Pigtail
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Spare 35A ATO Fuse
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(4) Stainless Steel Self-Tapping Mounting Screws
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Owner’s Manual & Tuning Guide
Amplify Your Outdoors. Stop letting limited space compromise your music. Add the JL Audio MX280/4 to your cart today and bring clean, distortion-free power to your open-air adventures.