JL Audio XDM400/4 4 Channel 400 W Class D Full-Range Car/Marine Amplifier – #98681

Brand: JL Audio
Model Number: XDM400/4
UPC: 699440986816
Model Number: XDM400/4
UPC: 699440986816
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JL Audio XDM400/4 4 Channel 400 W Class D Full-Range Car/Marine Amplifier – #98681

  • 4-channel car/marine amplifier
    • 75 watts RMS x 4 at 4 ohms
    • 100 watts RMS x 4 at 2 ohms
    • 200 watts RMS x 2 bridged at 4 ohms
  • Variable high- and low-pass filters (50-500 Hz, 12 dB/octave)
  • Class D amplifier design with NextD™ switching amp technology
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Frequently Bought Together

+JL Audio C2-650
Price for both:   $1,309.90

Product Description

Features & Specifications



JL Audio XDM400/4 4 Channel 400 W Class D Full-Range Car/Marine Amplifier – #98681

XDM400/4: 4-Channel Class D Full-Range Car/Marine Amplifier, 100 W x 4 @ 2 Ω / 75 W x 4 @ 4 Ω – 14.4V

The very small XDM400/4 produces a powerful 100 watts to each of its four channels into 2 ohms (14.4V, 1% THD), giving it a tremendous full-range punch. JL Audio’s  cutting-edge NexD™ high-speed switching design, which enables full bandwidth Class D operation with incredibly low distortion and exceptional efficiency, is the technology that enables this much power in such a small chassis.

The XDM400/4 is made with marine-grade materials and has a unique, dual-mode input filter for noise-free performance in boats or cars.  For simple factory system upgrades, automatic turn-on capability (through signal detection or DC-offset sensing) is also built in.

Build an impressive 1000 W amplification system with the XDM400/4 and XDM600/1 monoblock to drive four satellite speakers and a subwoofer—all while fitting it beneath a seat or deck. Alternately, utilize the XDM400/4 by itself to power two satellites, plus a subwoofer.

The XDM400/4 includes a 12 dB / octave filter for each channel bank, which can be configured as a low-pass or high-pass filter and offers continuously variable cutoff frequency selection from 50-500 Hz. With the addition of an optional HD-RLC or MHD-RLC (water-resistant) remote level controller (each sold separately), you have the ability to adjust the level of all amplifier channels or just the rear channels directly from the driver’s seat or cockpit.

Finished in a sleek, black powder-coat, all controls are protected beneath a gasketed, removable top cover for easy access.

XDM400/4 Product Hightlight:

  • Marine-grade materials on every model for maximum application versatility from just one amplifier line.
  • Exclusive, dual mode input filter, for noise-free performance in boats OR cars, every time!
  • Automatic turn-on option via Signal-Sensing or DC-Offset sensing
  • All controls on top, beneath a gasketed, removable cover for easy access.
  • Fits nearly anywhere: 8.52 x 7.09 x 2.05 in. (217 x 180 x 52 mm). 33% Smaller than HD600/4 and 61% smaller than 300/4v3!
  • Our advanced switching technology delivers exceptional efficiency to reduce current draw and heat, permitting reliable high power output from a compact, easy to install design.
  • Ultra-high speed switching and control circuitry delivers super-clean full-range audio with very low distortion and noise.
  • 12dB/octave high or low-pass filters for each channel bank with fully-variable frequency selection from 50-500 Hz via detented, calibrated potentiometers.
  • Optional remote level controllers (HD-RLC or MHD-RLC). Assignable to all four channels or rear channels only.
  • Preamp outputs (pass-through type)
  • Amplifier will never shut down due to thermal overload. EVER.
  • Totally transparent to user in most cases… Restores full power operation when it has cooled down to safe temperature.

Here are a few examples of how the XDM400/4 can be used:

  • Four-Channel Satellite Amp (drive front and rear speakers with 75W x 4)
  • Three-Channel System Amp (drive front speakers with 75W x 2 and a subwoofer with up to 200W)
  • Two-Channel, High-Power Satellite Amp (drive 1 pr. of speakers with 200W x 2)
  • Two-Channel, High-Power Subwoofer Amp (drive two subwoofers with 200W x 2)

XDM400/4 Physical Specifications:

Lineart Top-View and Side-View of XDM400/4 Amplifier with Height (H), Width (W) and Depth (D) dimension labels

  • Height (H): 2.05 in / 52 mm
  • Width (W): 8.52 in / 216 mm
  • Depth (D): 7.09 in / 180 mm
  • Net Weight: 6.3 lb / 2.86 kg


Model XDM400/4
Product: JL Audio XDM400/4 4 Channel 400 W Class D Full-Range Car/Marine Amplifier – #98681

RMS Power Output (Watts x Channels): 75 x 4
THD at Rated RMS Power: 1%
Signal to Noise Ratio: 104 dB
Input Voltage: 14.4v
Power at 2 Ohms (Watts x Channels): 100 x 4
Bridged Power (Watts x Channels): 200 x 2
Minimum Impedance Bridged: 4
Minimum Impedance Unbridged: 2

Amplifier Class: D
Low-Pass Crossover Frequency: 50-500 Hz
Low-Pass Slope (dB/octave): 12 dB/octave
High-Pass Crossover Frequency: 50-500 Hz
High-Pass Slope (dB/octave): 12 dB/octave
Bass Boost: No
Fan Cooled: No
Fuse Rating: 40
Speaker Level Inputs: Yes
Preamp Outputs: 1 pair
Height (inches): 2
Width (inches): 8-9/16
Depth (inches): 7-1/8

What's in the box

JL Audio XDM400/4 owner's manual
4-Channel car/marine amplifier
Self-adhesive JL Audio badge
2.5mm Allen wrench
Owner's Manual
Warranty information

Mobile Amplifier Channels

4 Channel

Mobile Amplifier Class

Class D

Mobile Amplifier Features

High-Pass Filter, Low-Pass Filter, Pre Amp Outputs, Speaker Level Inputs, Weather Resistant

Mobile Amplifier Fuse Rating


Mobile Amplifier RMS

351 to 750 watts

Mobile Min Impedance


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JL Audio Canada 2 Year Limited Manufacturers Warranty


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