JL Audio JD400/4 4-Ch 800W Car Amplifier

JL Audio JD400/4 4-Ch 800W Car Amplifier
(JL Audio JD400/4)

We Think You Should Know

• Australian JL Audio Warranty
• Purchase Guarantee (see T&Cs)
• 4Ch Class-D Amplifier
• 800W Maximum Power
• 75W x 4 RMS Power Output - 4Ω
• 100W x 4 RMS Power Output - 2Ω
• Soft start turn on
• Variable High-Pass & Low-Pass Crossovers

Overview

The JL Audio JD400/4 is a compact, high-efficiency 4-channel Class D full-range car amplifier, designed to deliver clean, accurate sound reproduction with reliable power output across various car audio configurations. With a maximum power rating of 800W and 75W RMS per channel at 4 ohms, the JD400/4 is an ideal solution for powering full-range speakers, component systems, or even bridging to drive subwoofers in smaller systems.

Built with JL Audio’s advanced NexD™ Class D switching technology, the JD400/4 delivers exceptional audio fidelity and superior efficiency while minimising distortion and heat generation. The amplifier features variable high-pass and low-pass crossover controls for precise system tuning, along with differential-balanced inputs for superior noise rejection and signal integrity.

Key Features:

With this robust 4-channel amplifier from JL Audio, exclusive NexD^™ high-speed switching technology delivers loads of clean power, full-range fidelity and superefficient performance from a surprisingly compact package. Additionally, a generous feature set adds even more value.

Class D NexD™ Switching Technology: High-speed switching minimises distortion, improves efficiency, and reduces heat buildup for reliable operation.

Variable Crossovers: Adjustable high-pass and low-pass filters (50Hz – 500Hz) for precise tuning and system flexibility.

Differential-Balanced Inputs: Minimises noise and maximises signal clarity, compatible with both RCA and speaker-level inputs.

Soft-Start Turn-On: Prevents system pops and electrical transients during power-up.

Protection Features: Includes thermal, over-current, and voltage protection for long-term reliability.

Compact Chassis Design: Small footprint allows for versatile installation in tight spaces. 

Frequency Response: 12Hz – 22kHz (+0, -1dB). Supports full-range high-fidelity audio playback.

Damping Factor: >60 @ 4 ohms. Provides superior speaker control and bass precision.

Applications:
The JL Audio JD400/4 is ideal for car audio enthusiasts seeking a powerful, efficient, and flexible amplifier to drive multi-speaker setups with precision and accuracy. Its compact size, clean output, and advanced circuit protection make it suitable for a wide range of vehicles and audio system configurations, from daily drivers to custom sound builds.

JL Audio - the Company

JL Audio, founded in 1975 by James Birch and Lucio Proni in Miramar, Florida, is renowned for its high-performance audio systems. Specialising in car, marine, and home audio, the company gained acclaim for its innovative subwoofers, notably the W6 and W7 series. JL Audio's commitment to quality is evident in its U.S.-based design and engineering, with many products manufactured in-house. In 2023, Garmin acquired JL Audio, integrating its premium audio solutions into Garmin's offerings. Despite the acquisition, JL Audio continues to deliver exceptional sound experiences, maintaining its legacy in the audio industry.

• 4Ch Class-D Amplifier
• 800W Maximum Power
• 75W x 4 RMS Power Output - 4Ω
• 100W x 4 RMS Power Output - 2Ω
• Soft start turn on
• Variable High-Pass & Low-Pass Crossovers

• JL Audio JD400/4 4-Ch 800W Car Amplifier