JL Audio XDM400/4
XDM Series 400W 4-Channel Class-D Car / Marine Audio Amplifier
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Precision Power for Your Marine Sound – JL Audio XDM400/4 4-Channel Marine Amplifier
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.
Key Features
| Category | Description |
|---|---|
| 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 |
Balanced Power Across Four Channels
- ✔ 4 x 100W RMS @ 2Ω or 4 x 75W @ 4Ω
- ✔ Bridgeable into 2-channel mode (200W x 2 @ 4Ω)
- ✔ Drives coaxials, components, or tower speakers
Efficient NexD™ Class D Technology
- ✔ Ultra-low distortion and high thermal efficiency
- ✔ Runs cool under load — no overheating
- ✔ Maximizes performance with minimal battery draw
Built Tough for the Open Water
- ✔ IPX6-certified for water and dust resistance
- ✔ Cast alloy chassis resists salt and corrosion
- ✔ Gasket-sealed controls protect internals
Flexible Configuration and Control
- ✔ Adjustable high- and low-pass filters (50–500 Hz)
- ✔ Variable input sensitivity for precise tuning
- ✔ Compatible with speaker- and RCA-level inputs
Compact Size, Big Performance
- ✔ 10.23" x 7.09" x 2.1" footprint fits tight spaces
- ✔ Mount in helm, cabin, or below deck
- ✔ Ideal for multi-zone audio configurations
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.
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
Specifications
| Specification | Details |
|---|---|
| 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% |
| Signal-to-Noise Ratio | >95 dB |
| Crossover Slope | 12 dB/octave |
| Input Voltage Range | 200 mV – 4V |
| Dimensions (W x D x H) | 10.23" x 7.09" x 2.1" |
| Weather Rating | IPX6 Marine-Certified |
Frequently Asked Questions (FAQ)
| Q: Can I power tower speakers with this amp? | A: Absolutely. The XDM400/4 can be bridged into 2-channel mode, delivering 200W x 2 @ 4Ω, perfect for high-output tower setups. |
| Q: Is this amplifier waterproof? | A: It’s IPX6-rated, meaning it’s water-resistant and built to handle direct splashes and saltwater exposure, but it should not be submerged. |
| Q: Do I need an extra amplifier for a subwoofer? | A: 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. |
| Q: Is this compatible with my factory head unit? | A: Yes, it accepts both RCA and speaker-level inputs, so it integrates with both OEM and aftermarket systems. |
| Q: Can I adjust the crossover settings? | A: Yes! It features adjustable high-pass and low-pass filters, letting you customize the sound for your exact speaker setup. |
| Q: Does it run hot? | A: No. Thanks to NexD™ Class D efficiency, it runs cool even under heavy loads. |
Marine-Grade Multi-Channel Power – Drive Your Sound with the XDM400/4
From towers to tweeters, this amplifier is ready to push crisp, clean sound wherever your boat takes you — with power, reliability, and marine protection to match.
FAQ
Do products purchased from San Diego Car Stereo come with a warranty?
Yes, all products come with a 1-year manufacturer warranty unless otherwise stated. This covers any defects excluding physical damage.
Are these products brand new?
Yes, every product we sell is 100% brand new, unused, and comes in original manufacturer packaging unless clearly marked otherwise.
Do you offer installation services?
Yes, we offer professional installation services at both of our San Diego Car Stereo locations. Our expert technicians have over 50 years of combined experience to install all of your car, marine, or offroad audio needs. Stop by or give us a call to schedule an appointment to get a quote in person.