JL Audio XDM400/4 Marine and Powersports Amplifier Single Channel
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JL Audio XDM400/4 Premium 4-Channel Car & Marine Amplifier
The Industry's Most Dependable 4-Channel Amplifier. Period.
When it comes to building a high-fidelity soundstage that can live through anything, the JL Audio XDM400/4 is the undisputed benchmark. This reference-grade, 4-channel multi-application 12V amplifier delivers a clean, continuous 400 Watts of RMS power.
Engineered to transition flawlessly between standard automotive setups and extreme marine installations, the XDM400/4 is the ultimate choice for upgrading a factory car system, powering multi-speaker zones on a center console, or building a high-power sound setup in your 4WD tourer.
High-Speed NexD™ Switching Technology
To overcome open-air wind, highway noise, and water slap, you need raw, clean power—but you shouldn't have to sacrifice your vehicle’s electrical charging system to get it. The XDM400/4 utilizes JL Audio’s proprietary NexD™ high-speed switching architecture. This design lets the amplifier operate at a massive power efficiency, generating negligible heat and drawing minimal current from your 12V battery while pumping out stellar, full-bandwidth sound with zero clipping.
Key Features & Benefits
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Dual-Environment Resilience: Built to last with corrosion-resistant, marine-grade internal materials, an aluminum housing, and stainless steel hardware. A sealed, gasketed control screen blocks moisture and dust from corroding your audio settings.
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Fully Bridgeable & Versatile Architecture: Customize your configuration on a whim. Power two pairs of coaxial speakers at 75W RMS each, bridge it into two channels to blast high-power wake tower speakers at 200W RMS each, or run it as a 3-channel system (75W x 2 for main cockpit speakers plus 200W x 1 for a 4$\Omega$ subwoofer).
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Differential-Balanced Noise Suppression: Actively filters out annoying alternator whine, electrical hiss, and ignition crackle before it ever reaches your speakers for a pure, dead-silent backdrop.
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Advanced Studio Crossovers: Outfitted with independent front and rear 12 dB/octave filters that can be quickly toggled between High-Pass or Low-Pass modes, with a continuously variable frequency sweep ranging from 50 to 500 Hz.
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Remote Level Customization: Plug in an optional water-resistant MHD-RLC or standard HD-RLC dial (sold separately) to give the driver or captain on-the-fly master volume or subwoofer level adjustment.
Power Output Specifications (14.4V Input)
| Load Configuration | RMS Power Output |
| 4 $\Omega$ Stereo (Per Channel) | 75 Watts RMS x 4 |
| 2 $\Omega$ Stereo (Per Channel) | 100 Watts RMS x 4 |
| 4 $\Omega$ Bridged (Mono Pairs) | 200 Watts RMS x 2 |
Technical Specifications
| Feature | Specification |
| Amplifier Class | Full-Range NexD™ Class D |
| Frequency Response | 12 Hz - 22 kHz (+0, -1dB) |
| Signal-to-Noise Ratio | >104 dB (A-weighted, referred to highest rated power) |
| Input Voltage Range | Switchable: 200 mV - 2V RMS (Low) / 800 mV - 8V RMS (High) |
| Filter Modes | Independent Front/Rear High-Pass or Low-Pass |
| Filter Range / Slope | Variable 50 Hz - 500 Hz / 12 dB/octave |
| Required Power / GND Wire | 4 AWG copper wire |
| Fuse Rating | 40 Amp (MaxiFuse™ or equivalent) |
| Dimensions (W x H x D) | 217 mm x 52 mm x 180 mm (8.52" x 2.05" x 7.09") |
| Warranty | 3 Years |
What's In The Box?
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(1) XDM400/4 4-Channel Power Amplifier
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(1) Removable Control Cover Shield (Pre-installed)
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(4) Stainless Steel Self-Tapping Mounting Screws
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2.5 mm Hex Key/Allen Wrench
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Complete Owner's Manual & Precision Tuning Guide
Upgrade to Legendary Audio. Stop letting wind and water wash out your playlist. Add the JL Audio XDM400/4 to your cart today and feed your speakers the clean, distortion-free power they were designed to handle.