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
RMS Power Output
- 75W x 4 @ 4 Ohms
- 100W x 4 @ 2 Ohms
- 200W x 2 Bridged @ 4 Ohms
Total Continuous Power
Frequency Response
Signal-to-Noise Ratio
Input Sensitivity
Input Type
- Differential-Balanced RCA Inputs
Crossover Controls
- Variable High-Pass Filter
- Variable Low-Pass Filter
Crossover Frequency Range
Operating Voltage
Recommended Fuse Rating
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.
