JL Audio JD400/4D 4-Channel Class D Car Amplifier | 400W RMS Total Power

The JL Audio JD400/4D is a premium 4-channel Class D car amplifier engineered to deliver exceptional sound quality, high efficiency, and reliable performance in a compact footprint. Featuring JL Audio's advanced NexD™ switching amplifier technology, the JD400/4D produces clean, dynamic power with minimal distortion while generating less heat than conventional amplifiers.

Perfect for powering front and rear coaxial speakers, component speaker systems, or a combination of speakers and subwoofers, this amplifier provides outstanding clarity, detail, and punch. Its compact chassis allows installation in tight spaces, making it ideal for modern vehicles where space is limited.

Built with premium-grade components and JL Audio's renowned engineering, the JD400/4D delivers audiophile-grade performance while maintaining excellent efficiency and long-term reliability.

Key Features

✔ Advanced NexD™ Class D Amplifier Technology

✔ Compact Chassis for Easy Installation

✔ 4-Channel Full Range Amplifier

✔ High-Efficiency Design with Low Heat Generation

✔ Differential-Balanced Inputs for Reduced Noise

✔ Variable High-Pass & Low-Pass Crossovers

✔ Bridgeable Channels for Increased Output

✔ Premium JL Audio Sound Quality

✔ Reliable Protection Circuitry

✔ Ideal for Component & Coaxial Speaker Systems

Technical Specifications

Amplifier Type

• Class D Full-Range Amplifier

Number of Channels

• 4 Channels

RMS Power Output

• 75W x 4 @ 4 Ohms
• 100W x 4 @ 2 Ohms
• 200W x 2 Bridged @ 4 Ohms

Total Continuous Power

• 400 Watts RMS

Frequency Response

• 12Hz – 22kHz (+0, -1dB)

Signal-to-Noise Ratio

• 104dB

Input Sensitivity

• 200mV – 4V

Input Type

• Differential-Balanced RCA Inputs

Crossover Controls

• Variable High-Pass Filter
• Variable Low-Pass Filter

Crossover Frequency Range

• 50Hz – 500Hz

Operating Voltage

• 11V – 16V DC

Recommended Fuse Rating

• 40A

Dimensions

• Approx. 8.66" × 7.09" × 2.01"
• 220mm × 180mm × 51mm

Applications

• Front & Rear Speaker Amplification
• Component Speaker Systems
• Coaxial Speaker Systems
• Active Audio Setups
• SQ (Sound Quality) Builds
• Daily Driver Audio Upgrades

Package Contents

• JL Audio JD400/4D Amplifier
• Installation Guide
• Mounting Hardware
• User Documentation

Why Choose JL Audio JD400/4D?

The JL Audio JD400/4D combines compact design, outstanding efficiency, and legendary JL Audio sound performance. Whether you're upgrading factory speakers or building a high-performance car audio system, this amplifier delivers powerful, clean, and accurate sound while offering the reliability and engineering excellence that JL Audio is known for worldwide.