JL Audio JLA-010-03115-00 XDM400/4 4-Channel Marine Amplifier

Ultra-compact 4-channel Class D amplification engineered for maximum power density with advanced NexD™ technology in a chassis that fits anywhere.

Product Overview

The JL Audio XDM400/4 4-channel amplifier represents the ultimate space-efficient solution for marine and automotive installations requiring serious full-range power in the smallest possible footprint. Delivering 100W RMS per channel at 2Ω (400W total) or 75W per channel at 4Ω (300W total), this ultra-compact Class D platform drives four satellite speakers or two speakers plus a subwoofer from a chassis that fits under seats, behind helm panels, or in shallow equipment bays where traditional amplifiers won't mount. Built using JL Audio's advanced NexD™ high-speed switching design with full-bandwidth Class D operation, the XDM400/4 achieves exceptionally low distortion and remarkable efficiency in marine-grade construction.

The versatile 4-channel configuration enables multiple system architectures: run all four channels independently for complete cabin/cockpit coverage, bridge two channels for 200W to a subwoofer while driving two satellites, or pair with the XDM600/1 monoblock for a stunning 1000W complete system (four satellites + subwoofer) that fits entirely under a seat. Variable 12dB/octave filtering on both channel banks (channels 1&2 and 3&4) with continuously variable 50Hz-500Hz cutoff enables precise tuning for different speaker types. Automatic turn-on via signal sensing or DC-offset sensing simplifies factory system integration. With marine-grade materials, gasketed removable top cover, and exclusive dual-mode input filter, the XDM400/4 delivers audiophile-grade performance in Australia's harshest coastal conditions.

Key Specifications

• 4-channel Class D amplifier with NexD™ technology optimised for full-range applications
• Maximum rated power (14.4V @ 2Ω, <1% THD): 100W RMS × 4 channels (400W total)
• Power at 4Ω load (14.4V @ 4Ω, <1% THD): 75W RMS × 4 channels (300W total)
• Bridged power (14.4V @ 4Ω, <1% THD): 200W RMS × 2 channels (400W total bridged)
• Operating voltage: 11-14.5 VDC (12V systems only)
• Ultra-compact chassis dimensions (specific measurements not provided in supplier data)
• Weight: Not specified
• Advanced NexD™ high-speed switching design
• Full-bandwidth Class D operation with extremely low distortion
• Marine-grade materials construction
• Gasketed removable top cover protects controls
• Exclusive dual-mode input filter for noise-free performance
• Automatic turn-on: Signal sensing or DC-offset sensing
• Variable 12dB/octave filters per channel bank
• Filter modes (Channels 1&2 and 3&4): Low-Pass or High-Pass
• Filter frequency range: 50Hz-500Hz (continuously variable)
• Remote level control: Optional HD-RLC or MHD-RLC (water-resistant)
• Remote level modes: All channels or rear channels only
• Black powder-coat finish
• 3-year manufacturer warranty (assumed standard XDM warranty)

Note: Detailed technical specifications including power ratings at 12.5V, signal-to-noise ratio, damping factor, THD+N measurements, input voltage range, fuse rating, wire gauge requirements, and physical dimensions are not provided in supplier documentation.

Features & Benefits

Ultra-Compact Power Density
The XDM400/4 delivers serious full-range power (100W × 4) in an ultra-compact chassis that fits locations where traditional amplifiers simply won't mount. Perfect for under-seat installations in boats with limited space, behind helm panels in centre console vessels, shallow cargo areas in dual-cab utes, or compact equipment bays in caravans. The small footprint doesn't compromise power output—JL Audio's NexD™ technology achieves full 400W capability in a package that disappears into tight installations.

Advanced NexD™ Full-Bandwidth Class D
JL Audio's proprietary NexD™ high-speed switching design permits full-bandwidth Class D operation with extremely low distortion and remarkable efficiency. Unlike conventional Class D amplifiers compromised by switching artifacts at high frequencies, the NexD™ topology maintains clean, undistorted output across the entire audible spectrum from deep bass to high treble. The exceptional efficiency reduces current draw, minimizes heat generation, and enables reliable high-power output from the compact chassis—critical for space-constrained marine installations.

Versatile System Configuration Options
Configure as a standalone 4-channel amp for complete cabin coverage, bridge two channels for 200W to a compact subwoofer while driving two satellites, or pair with the JL Audio XDM600/1 monoblock for a complete 1000W system (four satellites + dedicated subwoofer) that fits entirely under a seat or deck. The modular approach provides upgrade flexibility: start with the XDM400/4 for immediate needs, add the monoblock later for serious bass authority without replacing existing equipment.

Independent Channel Bank Filtering
Variable 12dB/octave filters on channels 1&2 and 3&4 enable precise system tuning. Configure as high-pass filters to protect speakers from damaging low frequencies, or low-pass filters for subwoofer duty when bridged. The continuously variable 50Hz-500Hz cutoff range accommodates marine coaxials, component speakers, and compact subwoofers. Independent filtering per channel bank allows front and rear speakers to operate at different frequency ranges, maximizing system performance without external crossovers.

Exclusive Dual-Mode Input Filter
JL Audio's proprietary dual-mode input filter combined with differential-balanced circuitry delivers outstanding noise rejection and crystal-clear audio performance in boats or cars. The filter automatically adapts to electrical noise characteristics common in marine environments (alternator whine, bilge pump interference) or automotive installations (ignition noise, accessory interference). Critical for maintaining audiophile-grade sound quality in electrically noisy environments where conventional amplifiers produce audible interference.

Automatic Turn-On Capability
Dual-mode turn-on detection (signal sensing or DC-offset sensing) enables seamless integration with factory audio systems or aftermarket source units without separate remote turn-on wiring. Signal sensing detects audio signal on RCA inputs, while DC-offset sensing detects DC voltage from source unit output. Simplifies factory system upgrades in commercial vessels, charter boats, or vehicles where complex wiring modifications aren't practical or desirable.

Optional Remote Level Control
Add JL Audio's HD-RLC or MHD-RLC (not included) for convenient output adjustment from the helm, driver's seat, or entertainment area. Switch between two modes: adjust all channels simultaneously (master volume control), or adjust rear channels only (preserve front speaker levels while controlling rear fill). Essential for marine applications where the amplifier is mounted in inaccessible equipment bays, or quick adjustments between moored and underway conditions.

Marine-Grade Construction
Built with marine-grade materials to withstand salt spray, bilge moisture, and corrosive coastal environments. The gasketed removable top cover protects controls and circuitry from moisture ingress while enabling easy access for tuning and adjustment. The black powder-coat finish resists corrosion in Australian conditions from tropical Queensland humidity to Southern Ocean salt spray. Suitable for protected equipment bays, under helm panels, or cabin locations with normal marine moisture exposure.

Technical Specs

• Amplifier class: Class D (NexD™ high-speed switching design)
• Channels: 4 (Full-range)
• Operating voltage: 11-14.5 VDC (12V models only - NOT 24V compatible)

Power Output (14.4V input):

• Maximum rated power (14.4V @ 2Ω, <1% THD): 100W RMS × 4 (400W total)
• Power at 4Ω load (14.4V @ 4Ω, <1% THD): 75W RMS × 4 (300W total)
• Bridged power (14.4V @ 4Ω, <1% THD): 200W RMS × 2 (400W total bridged)

Signal Processing:

• Filter modes (Channels 1&2 and 3&4): Low-Pass or High-Pass
• Filter slope: 12dB/octave
• Filter frequency range: 50Hz-500Hz (continuously variable)
• Exclusive dual-mode input filter: Yes (for noise rejection)

Protection & Control:

• Automatic turn-on: Signal sensing or DC-offset sensing
• Remote level control compatibility: Optional HD-RLC or MHD-RLC (water-resistant)
• Remote level modes: All channels or rear channels only

Physical Specifications:

• Dimensions: Not specified (ultra-compact design)
• Weight: Not specified
• Construction: Marine-grade materials
• Protection: Gasketed removable top cover
• Finish: Black powder-coat
• Warranty: 3 years (assumed standard XDM warranty)

Important Note: Detailed specifications including power ratings at 12.5V input, physical dimensions, weight, frequency response, signal-to-noise ratio, damping factor, THD+N measurements, input voltage range, fuse rating, and wire gauge requirements are not provided in available supplier documentation.

Compatible With / Goes Well With

Speaker Recommendations:

• Marine coaxial speakers rated 75-100W RMS (6", 6.5", 6×9" sizes)
• Marine component speaker systems rated 75-100W RMS per channel
• Compact marine subwoofers rated 200W RMS (when bridging two channels)
• Full-range cabin speakers for complete coverage

Recommended System Pairings:

• JL Audio XDM600/1 monoblock (pair for complete 1000W system: 4 satellites + subwoofer)
• JL Audio XDM300/1 monoblock (pair for 700W system: 4 satellites + 300W sub)

Installation Accessories:

• Marine-grade amplifier wiring kit (gauge requirements not specified)
• JL Audio HD-RLC or MHD-RLC water-resistant remote level control
• Marine-grade speaker wire (14-16 AWG recommended for most runs)
• RCA interconnect cables with marine-grade shielding
• Distribution blocks for power/ground distribution
• Amplifier mounting brackets for compact installations
• Sound deadening material for mounting surfaces

System Compatibility:

• Marine head units with 2-4 channel preamp outputs
• Aftermarket head units with front/rear preamp outputs
• Line output converters for factory radio integration
• 12V electrical systems with adequate alternator capacity

Caution: Detailed specifications including fuse rating, wire gauge requirements, and physical dimensions are not provided in available documentation. Consult JL Audio technical support or authorized dealers before purchase to ensure proper electrical system sizing and installation space verification.

Frequently Asked Questions

How small is the XDM400/4 compared to traditional 4-channel amplifiers?
The XDM400/4 is described as "ultra-compact" with dimensions specifically designed to fit under seats, behind helm panels, or in shallow equipment bays. While exact measurements aren't provided in available documentation, it's engineered for installations where traditional amplifiers won't fit while still delivering 100W × 4 output.

Can I run a subwoofer with this 4-channel amplifier?
Yes. Bridge channels 3+4 (or 1+2) for 200W RMS to a 4Ω compact subwoofer, leaving the other two channels unbridged for 75-100W to satellite speakers. This configuration is ideal for boats or vehicles requiring bass reinforcement without dedicating a separate monoblock amplifier in space-constrained installations.

Should I pair this with the XDM600/1 monoblock for a complete system?
JL Audio specifically recommends this pairing to create a stunning 1000W amplification system (400W for four satellites from the XDM400/4 plus 600W for subwoofer from the XDM600/1) that fits entirely under a seat or deck. The modular approach provides clean installation, proper power distribution, and dedicated subwoofer control without compromising main speaker performance.

How does the automatic turn-on work without a remote wire?
The amplifier features dual-mode detection: signal sensing (detects audio signal on RCA inputs) or DC-offset sensing (detects DC voltage from source unit output). Select the appropriate mode based on your source unit—signal sensing for most aftermarket units, DC-offset for many factory systems. Eliminates complex wiring in factory system upgrades.

What does the remote level control adjust?
With the optional HD-RLC or MHD-RLC remote, you can select between two modes: adjust all channels simultaneously (master volume for entire system), or adjust rear channels only (preserve front speaker levels while controlling rear fill intensity). The mode selection depends on your listening preferences and system configuration.