4-Channel Class-D Full-Range Amplifier, 100-Watt x 4-Channel @ 2-Ohm or 75-Watt x 4-Channel @ 4-Ohm
This tiny amplifier packs a serious full-range punch, delivering a staggering 100 watts to each of its four channels into 2 ohms (14.4V, 1% THD). The breakthrough that makes this much power possible in such a small chassis is JL's NexD™ ultra-high-speed switching design, which allows for full bandwidth Class D operation with extremely low distortion and outstanding efficiency.
Use the XD400/4v2 in combination with our XD600/1 monoblock to build a 1000 W amplification system to power four satellites and a subwoofer... and fit the whole thing under a seat. Or, use the XD400/4v2 by itself to power two satellites, plus a subwoofer. With XD's, the possibilities are endless.
The XD400/4v2 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.
The XD400/4v2 also features the v2 Spec feature set, which consists of automatic turn-on capability (via signal sensing or DC-offset sensing), and a dual-range differential-balanced input section able to handle a wide range of input voltage levels. With the addition of an HD-RLC remote level control (sold separately), the amplifier's level can be directly controlled from the driver's seat.
This amplifier features a black powder-coat finish and a gasketed, brushed aluminum cover for the controls.
Specifications
Frequency Response |
12 Hz - 22 kHz (+0, -1dB) |
S/N Ratio, referred to highest rated power |
>104 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth) |
S/N Ratio, referred to 1 W |
>84 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth) |
Damping Factor @ 4 Ω |
>150 / 50 Hz |
Damping Factor @ 2 Ω |
>75 / 50 Hz |
THD+N @ Rated Power |
<1% @ 2 Ω per Ch. |
Input Voltage Range @ RCA Inputs |
Switchable from 200 mV - 2 V RMS (Low) to 800 mV - 8 V RMS (High) |
Min.Copper Power / Ground Wire Gauge |
4 AWG wire |
Fuse Rating |
40 A (AFS, AGU or MaxiFuse™) |
@ 4 Ω |
75 W RMS x 4 |
@ 2 Ω |
100 W RMS x 4 |
Bridged @ 4Ω |
200 W RMS x 2 |
Signal Processing
Filter Mode(s) |
Low-Pass or High-Pass |
Filter Slope(s) |
12 dB/octave |
Filter Frequency Range |
50 Hz - 500 Hz |
Detented, Calibrated Filter Freq. Potentiometers |
Yes |
Filter Defeat Function |
Yes |
Remote Level Control |
Optional (HD-RLC) |
Remote Level Modes |
2 or All channels |
Channel Input Mode Switch |
Yes (2/4 ch.) |
Pass-Through Preamp Output |
Buffered |
Source Channel Selection for PreOuts |
Yes |
Physical Specifications

Height (H) |
2.05 in / 52 mm |
Width (W) |
8.52 in / 216 mm |
Depth (D) |
7.09 in / 180 mm |
Net Weight |
4.75 lb / 2.15 kg |