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JL Audio - JX400/4D: 4 Ch. Class D Full-Range Amplifier, 400 W
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JL Audio - JX400/4D: 4 Ch. Class D Full-Range Amplifier, 400 W

4-Channel Class D Full-Range Amplifier, 100 W x 4 @ 2 Ω / 70 W x 4 @ 4 Ω - 14.4V

The JX400/4D employs a highly-efficient Class D design with a robust MOSFET power supply to deliver a strong 100 watts to each of its four channels into 2 ohms (14.4V, 1% THD).

Use the JX400/4D in combination with our JX500/1D or JX1000/1D monoblocks to build an amazing amplification system at a very affordable price. Or, use the JX400/4D by itself to power two satellites, plus a subwoofer.

The JX400/4D includes a defeatable 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 50-200 Hz. Dedicated hi-level inputs are included, in addition to conventional low-level RCA inputs, making it easy to integrate with a variety of OEM and aftermarket head units.


Rated Continuous (RMS) Power @ 14.4 V

@ 4 Ω    70 W RMS x 4
@ 2 Ω    100 W RMS x 4
Bridged @ 4Ω    200 W RMS x 2

Rated Continuous (RMS) Power @ 12.5 V

@ 4 Ω    50 W RMS x 4
@ 2 Ω    80 W RMS x 4
Bridged @ 4Ω    160 W RMS x 2

General Specifications

Frequency Response: 20 Hz - 20 kHz (+0, -1dB)
S/N Ratio, referred to highest rated power: >93 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
S/N Ratio, referred to 1 W: >76 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)
Damping Factor @ 4 Ω: >60 / 50 Hz
Damping Factor @ 2 Ω: >30 / 50 Hz
THD+N @ Rated Power: <1% @ 2 Ω per Ch.
Input Voltage Range @ RCA Inputs: 200 mV - 4 V RMS
Input Voltage Range @ High-Level Inputs: 2 V - 10 V RMS
Min.Copper Power / Ground Wire Gauge: 4 AWG wire
Fuse Rating: 40 A (AFS, AGU or MaxiFuse™)

Signal Processing

Filter Mode(s): Low-Pass or High-Pass
Filter Slope(s): 12 dB/octave
Filter Frequency Range: 50 Hz - 200 Hz
Detented, Calibrated Filter Freq. Potentiometers: No
Filter Defeat Function: Yes
Remote Level Control: No
Remote Level Modes: N/A
Channel Input Mode Switch: Yes (2/4 ch.)
Pass-Through Preamp Output: Unbuffered
Source Channel Selection for PreOuts: No (always 2 Ch)

Physical Specifications

Height (H)    2.15 in / 55 mm
Width (W)    9.05 in / 230 mm
Depth (D)    7.68 in / 195 mm
Net Weight    4.80 lb / 2.18 kg

Class D Circuitry - Full-Range


Optimized, Class D amplifier circuitry delivers high efficiency without sacrificing full-range frequency fidelity.

Detailed Information:

The design of our full-range Class D amplifier circuitry places a high emphasis on damping of the driven load and full-range frequency control. Exceptional efficiency is also achieved, which allows the amplifier to be physically compact and also draws far less current from a vehicle’s electrical system during high-power operation.

List Price: $299.99
Price: $249.99
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