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JL Audio VX400/4i

400W RMS Class D 4 Channel Car Amplifier with Built-in DSP

JL Audio
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• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes integrated DSP

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Description


JL Audio brand icon

Authorized dealer

4-Channel Class D Full-Range Amplifier with Integrated DSP

The JL Audio VX400/4i is an ultra-compact, high-fidelity 4-channel amplifier from the premium VXi series. It is a dual-threat component, combining JL Audio’s second-generation NexD2 switching technology with a powerful, studio-grade digital signal processor (DSP). This allows it to act as both the "brains" and the "brawn" of your audio system, giving you total control over the acoustic environment from a single device.

The VX400/4i is designed to replace traditional knobs and switches with software-based tuning. Using JL Audio’s TüN software (available for PC, tablet, or smartphone), you can adjust every parameter—including parametric EQ, time alignment, and complex crossovers—with precision. Its DirectFET outputs and synchronized master clock ensure that the Class D amplification remains exceptionally clean and efficient.

Product Details:

  • VXi Series Class D 2 ohm Stable 4-Channel Amplifier
  • RMS Power Rating:
    • 4 ohm: 75 watts x 4 channel
    • 2 ohm: 100 watts x 4 channel
    • Bridged: 200 watts x 2 channel @ 4 ohm
  • Total power output: 400 watts
  • Wired Bass Remote JL Audio DRC-100 and JL Audio DRC-205 (sold separately)
  • Speaker-level (high-level) inputs (requires JL Audio XD-CLRAIC2-SW)
  • 1 pair of preamp outputs
  • Features no knob and switches
  • Free TüN software available for most devices
  • USB connection for device running TüN app (6-foot cable included)
  • Versatile design accepts speaker level signals without a LOCs
  • Delivers outstanding noise rejection
  • Advanced rollback protection circuitry
  • Fully configurable output channel via the TüN software interface
  • JLid protocol command for easy control for VXi and optional JLid accessories
  • Also includes integrated DSP technology
  • NexD2 switching technology for enhanced efficiency
  • Automatic turn-on options via signal-sensing or DC-offset sensing
  • Input sensitivity: 0.2 - 16 volts
  • Frequency Response: 12 - 21000 Hz
  • Total Harmonic Distortion (THD): 1%
  • Signal to Noise Ratio: 99 dB
  • Fuse Rating: 40A (AFS, AGU or MaxiFuse)
  • 4 AWG gauge amplifier wiring kit is recommended for installation
  • Dimensions: 9.02" L x 6.62" W x 2.12" H
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty
  • MFR #: VX400/4i

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Specifications & Details


Key Features
Amplifier Key Features
Built-in DSP
Speaker Level Inputs
Power Specifications - Full Range Channels
RMS Power @ 4 ohms
75 watts x 4 channel
RMS Power @ 2 ohms
100 watts x 4 channel
Bridged RMS Power
200 watts x 2 channel
Amplifier Specifications
Series
VXi Series
Amplifier Class
D
Number of Channels
4-Channel
Total RMS Power Output
400 watts
Maximum Input Gauge Size
4 AWG
Minimum Impedance Unbridged
2 ohm
Minimum Impedance Bridged
4 ohms
Frequency Response
12 - 21000 Hz
THD at Rated RMS Power
1%
Speaker Level Inputs
Optional (Requires Accessory Adapter)
Preamp Outputs
1 pair
Built-in Crossover
Band-Pass (BP)
Low-Pass (LP)
High-Pass (HP)
Signal-to-Noise Ratio
99 dB
Remote bass/level controller
Optional (Accessory required and sold separately)
Fuse Rating
40A x 1 
Total Fuse Rating
40
Strappable
No
Amp Bluetooth Connectivity
Yes
Hi-Res Certified
No
Low-Level Input Sensitivity
0.2 - 16 volts
High-Level Input Sensitivity
0.2 - 16 volts
What is in the box?
Paperwork
User manual
Warranty/Registration card
WITB: Amplifiers
Amplifier
Allen wrenches (2)
Other Accessory #1
Power connector
Other Accessory #2
Analog input harness
Other Accessory #3
Speaker output harness
Other Accessory #4
6-foot USB A/B cable
Other Accessory #5
Four corner caps
Other Accessory #6
Corner cap tool
Warranty and Return Policy
Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

VX400/4i

Weight:

8.30lbs

Internal SKU:

vx4004i

Internal Product ID:

153629

Customer Ratings & Reviews


JL Audio VX400/4i thumbnail image

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