Precision Power for Your Marine Sound – JL Audio XDM400/4 4-Channel Marine Amplifier

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Introduction

The JL Audio XDM400/4 is a compact, high-performance 4-channel marine amplifier engineered to bring crystal-clear power to your boat’s full-range speakers. Whether you're cruising the coastline or docked at sunset, this amplifier provides clean, consistent output that elevates your entire marine audio system. Built with JL Audio’s NexD™ Class D technology and full marine-grade durability, the XDM400/4 is your all-weather solution for premium sound on the water.

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Balanced Power Across Four Channels

With 100 watts RMS per channel at 2 ohms (or 75 watts at 4 ohms), the XDM400/4 is ideal for powering a full system of four marine coaxial or component speakers. You can also bridge it into 2-channel mode to drive a pair of high-performance tower speakers or subwoofers. It’s a flexible solution for both simple and advanced multi-zone marine audio systems, delivering JL Audio’s signature sound with power and precision.

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Efficient NexD™ Class D Technology

At the heart of the XDM400/4 lies JL Audio’s advanced NexD™ high-speed switching technology. This ensures ultra-low distortion, low heat output, and consistent high-efficiency operation, even under heavy loads. Your system will run cool and clear, maximizing amplifier performance while minimizing power draw from your boat’s electrical system — a must for marine applications.

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Built Tough for the Open Water

The XDM400/4 isn’t just resistant to water — it’s built to thrive in it. Featuring a corrosion-resistant cast alloy chassis, marine-grade stainless steel hardware, and gasket-sealed controls, this amplifier is rated for IPX6 water intrusion protection. Salt spray, UV rays, moisture, and extreme heat are no match for its rugged construction, making it perfect for the demanding marine environment.

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Flexible Configuration and Control

With its adjustable high- and low-pass filters (50–500 Hz) and variable input sensitivity, the XDM400/4 gives you complete control over your sound. It integrates easily with both aftermarket and OEM marine head units, accepting both RCA line-level and speaker-level inputs. Add a JL Audio HD-RLC remote level controller (sold separately) for convenient on-the-fly volume adjustments from your helm or cockpit.

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Compact Size, Big Performance

Despite its big power output, the XDM400/4 has a compact footprint that fits easily in tight spaces onboard. Whether you’re outfitting a small center console or a large yacht, it provides professional-grade power in a sleek, space-efficient design.

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Key Features

• 4 x 100W @ 2Ω / 4 x 75W @ 4Ω RMS: Clean power for full-range marine speakers.

• 2-Channel Bridging Capability: Ideal for high-output tower speakers or subwoofers.

• NexD™ Switching Technology: High efficiency, low heat, ultra-clean audio.

• Fully Marine-Grade Build: Sealed, corrosion-resistant, IPX6-rated chassis.

• Variable Crossovers (HP/LP): Fine-tune speaker performance (50–500 Hz).

• Compact Form Factor: Easy to install in tight spaces.

• Speaker- and RCA-Level Inputs: Flexible integration into any marine system.

• Optional HD-RLC Remote Compatibility: Remote level control for added convenience.

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Why Choose the JL Audio XDM400/4?

When you need robust, reliable power for your marine speakers, the JL Audio XDM400/4 delivers. With its clean output, marine-grade construction, and installation flexibility, it’s perfect for boaters who want to build a top-tier sound system without overcomplicating things. Whether it's your main system amp or part of a multi-zone setup, the XDM400/4 is designed to perform flawlessly under pressure — and keep your music pumping through salt, sun, and sea spray.

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What’s in the Box?

• 1 x JL Audio XDM400/4 4-Channel Marine Amplifier

• 1 x Mounting Hardware Kit

• 1 x User Manual

• 1 x JL Audio Decal

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Specifications

• Rated Power (RMS):

  • 4 x 75W @ 4Ω

  • 4 x 100W @ 2Ω

  • 2 x 200W @ 4Ω (bridged)

• Frequency Response: 12 Hz – 22 kHz

• Damping Factor: >150 @ 4Ω per channel

• THD+N: <1%

• Crossover Slope: 12 dB/octave

• Signal-to-Noise Ratio: >95 dB

• Input Range: 200 mV – 4V

• Dimensions: 10.23" x 7.09" x 2.1"

• Weather Rating: IPX6 Marine-Certified

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FAQs

Can I power tower speakers with this amp?

• Absolutely. The XDM400/4 can be bridged into 2-channel mode, delivering 200W x 2 @ 4Ω, perfect for high-output tower setups.

Is this amplifier waterproof?

• It’s IPX6-rated, meaning it’s water-resistant and built to handle direct splashes and saltwater exposure, but it should not be submerged.

Do I need an extra amplifier for a subwoofer?

• You can bridge two channels to power a sub, but for dedicated high-watt subwoofer systems, consider pairing this with a JL Audio XDM monoblock amplifier like the XDM600/1 or XDM1000/1.

Is this compatible with my factory head unit?

• Yes, it accepts both RCA and speaker-level inputs, so it integrates with both OEM and aftermarket systems.

Can I adjust the crossover settings?

• Yes! It features adjustable high-pass and low-pass filters, letting you customize the sound for your exact speaker setup.

Does it run hot?

• No. Thanks to NexD™ Class D efficiency, it runs cool even under heavy loads.