JL Audio VX400/4i 4-Channel Amp with Integrated DSP

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JL Audio VX400/4i

4-Channel Class D Full-Range Amplifier with Integrated DSP, 100 W x 4 @ 2 Ω / 75 W x 4 @ 4 Ω - 14.4V


Designed to simplify great audio, every VXi amplifier combines our advanced NexD2™ switching amplifier technology with an integrated, full-featured digital signal processor.

With our second-generation NexD2™ technology, the VX400/4i full-range amplifier outputs up to 75 watts per channel into 4 ohms, or 100 watts into 2 ohms. It can also be bridged into 4 ohms, producing up to 200 W x 2.

The NexD2™ full-range technology in this amplifier is DSP-controlled and features a reduced loop area design utilizing DirectFET™ outputs for outstanding fidelity, very low noise and exceptional efficiency. The amplifier chassis is ultra-compact, with all connections on one side, to greatly simplify installation into tight spaces.

Instead of traditional control knobs and switches, all amplifier adjustments and DSP functionality are configured via a compatible external device (PC, Tablet or Smartphone), with the appropriate JL Audio TüN™ Software application installed.

Amplifier includes: Power Connector (for 4 AWG wire), Analog Input/Pre-Out Harness, Speaker Output Harness, 6 ft A/B USB Cable


NexD2™ Switching Technology

JL Audio's NexD2 amplifier technologies are a next-level approach to improving what is already an outstanding Class D design platform. Employing new components and more advanced circuit layouts, fidelity and efficiency have been significantly enhanced.


General Specifications

Frequency Response

12 Hz - 24 kHz (+0, -1dB)

S/N Ratio, referred to highest rated power
(Analog Inputs)

99 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)

S/N Ratio, referred to 1 W
(Analog Inputs)

80 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)

S/N Ratio, referred to highest rated power
(Digital Inputs)

101 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)

S/N Ratio, referred to 1 W
(Digital Inputs)

81 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)

Damping Factor @ 4 Ω

>100 / 50 Hz

Damping Factor @ 2 Ω

>50 / 50 Hz

THD+N @ Rated Power

<1% @ 2 Ω per Ch.

Input Voltage Range @ RCA Inputs

200 mV - 16 V RMS

Min.Copper Power / Ground Wire Gauge

4 AWG wire

Fuse Rating

40 A (AFS, AGU or MaxiFuse™)


Rated Continuous Power @ 14.4V

@ 4 Ω

75 W RMS x 4

@ 2 Ω

100 W RMS x 4

Bridged @ 4Ω

200 W RMS x 2

Rated Continuous Power @ 12.5V

@ 4 Ω

60 W RMS x 4

@ 2 Ω

90 W RMS x 4

Bridged @ 4Ω

Extra Information

JL Audio