



JL Audio JD400/4
JD Series 400W 4-Channel Car Amplifier
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Upgrade Your Car Audio with JL Audio JD400/4 – Premium 4-Channel Amplifier
Enhance your car audio system with the JL Audio JD400/4 4-Channel Amplifier. Engineered to deliver exceptional power and pristine sound quality, this high-performance amplifier brings your favorite music to life. Whether you're a daily commuter or an audiophile on a road trip, the JD400/4 ensures you enjoy every moment with immersive audio.
| Key Feature | Details |
|---|---|
| High-Performance 4-Channel Amplifier | Designed to provide deep, accurate sound with minimal distortion for an immersive listening experience. |
| Advanced Multi-Channel Amplifier | Offers superior sound quality and performance, allowing multiple speakers to be driven efficiently. |
| NexD™ Switching Technology | Ensures high efficiency and low distortion, delivering a clearer audio signal. |
| High-Quality Construction | Built to last with durable materials that ensure long-term reliability. |
| Regulated, Intelligent Power Supply | Provides consistent power output for optimal performance, even under varying load conditions. |
Advanced Design and Materials
The JL Audio JD400/4 is engineered with advanced materials to provide superior sound quality and durability. Key features include:
- NexD™ Switching Technology: Maintains high efficiency and minimizes distortion.
- Regulated Power Supply: Ensures consistent performance even under heavy loads.
- Cast Alloy Heat Sink: Efficiently dissipates heat to ensure reliable operation.
- Differential-Balanced Inputs: Reduces noise for cleaner sound.
Seamless Integration with Existing Systems
The JL Audio JD400/4 4-Channel Amplifier is designed for easy integration with a wide range of aftermarket or factory car audio systems. Key integration features include:
- Universal Compatibility: Works with most car audio systems for easy integration.
- Easy Installation: Includes wiring options and mounting hardware for hassle-free setup.
- Improved Audio Performance: Boosts overall sound quality and volume for a more immersive experience.
Durability and Reliability
Built to withstand the rigors of daily use, the JD400/4 features a rugged construction and advanced protection mechanisms to ensure reliable performance over time. Features include:
- Rugged Construction: Durable materials for long-lasting performance.
- High-Quality Components: Designed for long-term performance under demanding conditions.
- Advanced Protection: Resists environmental and mechanical stress for enhanced longevity.
Why Choose JL Audio JD400/4?
Invest in the JL Audio JD400/4 4-Channel Amplifier for a superior audio experience tailored to your vehicle. Known for its reliability and high performance, JL Audio products enhance your driving enjoyment. Key benefits include:
- Superior Sound Quality: Clear, powerful sound with minimal distortion.
- High-Quality Construction: Built to endure daily use while maintaining optimal performance.
- Universal Compatibility: Integrates with most car audio systems for hassle-free upgrades.
- Durable and Reliable: Built to provide long-lasting performance in all conditions.
Specifications
| Specification | Details |
|---|---|
| Amplifier Type | 4-Channel |
| Power Output | 75W RMS x 4 @ 4 ohms, 100W RMS x 4 @ 2 ohms, 200W RMS x 2 @ 4 ohms (bridged) |
| Frequency Response | 20Hz–20kHz |
| Signal-to-Noise Ratio | >95 dB |
| THD+N | <1% |
| Dimensions | 8.66" x 7.09" x 2.09" |
| Compatibility | Universal |
What’s In the Box
- JL Audio JD400/4 4-Channel Amplifier
- Wiring Harness
- Mounting Hardware
- User Manual
Conclusion
Upgrade your car audio system with the JL Audio JD400/4 4-Channel Amplifier and experience superior sound quality in a sleek design. Offering powerful performance, universal compatibility, and enhanced durability, this amplifier is the perfect addition to any vehicle. Enjoy crystal-clear audio on every drive with JL Audio.
Frequently Asked Questions
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What makes the JL Audio JD400/4 4-Channel Amplifier stand out?
The JD400/4 features a 4-channel design with NexD™ switching technology to provide superior sound quality with clear, powerful sound and minimal distortion, making it ideal for enhancing your car audio system. -
Is the JL Audio JD400/4 easy to install?
Yes, the amplifier comes with a variety of wiring options and includes mounting hardware for easy setup and installation. -
Can the JL Audio JD400/4 integrate with any car audio system?
Yes, the JD400/4 is designed for universal compatibility and can be integrated with most car audio systems for improved audio performance. -
Is the JL Audio JD400/4 durable?
Yes, the amplifier is built with rugged construction and features high-quality components to ensure reliable performance and protect against damage. -
What are the specifications of the JL Audio JD400/4 4-Channel Amplifier?
The amplifier features a 4-channel design, a power output of 75W RMS x 4 @ 4 ohms, 100W RMS x 4 @ 2 ohms, 200W RMS x 2 @ 4 ohms (bridged), a frequency response of 20Hz-20kHz, a signal-to-noise ratio of >95 dB, a THD+N of <1%, and dimensions of 8.66" x 7.09" x 2.09". -
Does the JL Audio JD400/4 4-Channel Amplifier come with a warranty?
Yes, the JD400/4 typically comes with a manufacturer’s warranty, providing peace of mind with your purchase.

JL Audio JD400/4 JD Series 4-Channel 100W RMS x 4, Class-D Full-Range Car Amplifier
Experience premium sound and powerful performance with the JL Audio JD400/4 4-Channel Class D Full-Range Amplifier. Designed for efficiency, flexibility, and clarity, this compact amplifier delivers 75 watts RMS per channel at 4 ohms or 100 watts RMS at 2 ohms, ensuring clean, dynamic sound throughout your vehicle. Built with advanced NexD™ Switching Technology, it provides high power output with minimal distortion and superior thermal management. The Differential-Balanced Inputs eliminate unwanted noise for crystal-clear audio, while variable high- and low-pass filters let you fine-tune your system for optimal performance. Switch effortlessly between 4-channel and bridged 2-channel modes to power multiple speakers or subwoofers. Backed by JL Audio’s 3-way protection circuitry and a rugged aluminum chassis, the JD400/4 offers reliable, high-quality amplification in a compact and versatile design.
Key Features
- 75W RMS x 4 @ 4 Ohms / 100W RMS x 4 @ 2 Ohms
- Bridged Power Output: 200W RMS x 2 @ 4 Ohms
- NexD™ Class-D Switching Technology for Clean, Efficient Power
- 3-Way Protection Circuitry: Thermal, Overload, and Short Circuit Protection
- Differential-Balanced Inputs for Noise-Free Signal Transfer
- Variable High- and Low-Pass Filters for Frequency Control
- Compact, Lightweight Design for Flexible Installation
- Frequency Response: 12 Hz – 22 kHz for Full-Range Clarity
- Signal-to-Noise Ratio: 108 dB for Crystal-Clear Sound
- Sleek Extruded Aluminum Chassis for Enhanced Durability
- Includes 2.5mm & 3mm Hex Keys and Owner’s Manual
What's Inside?
- 4-Channel Class D Full-Range Car Amplifier
- 2.5mm Hex Key
- 3mm Hex Key
- Owner's Manual
What Others Are Saying
Eddie was great - SDCS installed a new head unit in my 2019 4Runner. He was honest in his opinions regarding the options I was considering. Pricing was also good - he was able to reuse some of my existing installation kit so I saved a bit of $$.Installation was clean and fast and he took the time to walk through the features before I left. Highly recommend!!
I had a great time at this shop! The staff really knows their stuff and took the time to explain the different options without pressure. Installation was quick, clean and professional. Everything looks factory and sounds amazing. The prices were fair and customer service was above and beyond. I highly recommend this place if you're looking for quality car audio and excellent service.
Those guys are really professional! I had a new Alpine floating head unit installed in my 2008 Mercedes, and it feels like a brand-new car. The installation was super clean. At first, the sound wasn’t the same as the factory stereo, but Kevin tuned it to be just as good—if not better—without adding any new amps. They even used my factory GPS antenna so I don’t have extra wires hanging out. On top of that, they matched the online price. Big thanks to Kevin and Eddie—highly recommended!
Kevin was awesome, he took his time and explained everything to me. I went in initially for a dash cam install and then decided to get a sub and amp installed as well. Both turned out great and will be returning if I need more work done.
Came In not knowing what to expect when suddenly my stereo stopped working. Spoke with Kevin in the front and after a VERY fast diagnosing they discovered my wiring was incorrect. After only about 45 minutes total being in the store I was on my way to the beach with a working stereo again! Thank you so much SDCARSTEREO
Highly recommend Kevin and the team at San Diego Car Stereo for any issues with aftermarket stereos. I bought a car with an aftermarket stereo and AC unit that wasn’t working properly—specifically, the heat wasn’t functioning due to an improper setup. I had several people look at it with no luck, and even the dealership basically refused to help because it was an aftermarket install. I came to Kevin and his team over the holidays feeling pretty defeated, but he was confident he could get the heat working before I headed back to a Colorado winter. Sure enough, he got it done.
FAQ
Do products purchased from San Diego Car Stereo come with a warranty?
Yes, all products come with a 1-year manufacturer warranty unless otherwise stated. This covers any defects excluding physical damage.
Are these products brand new?
Yes, every product we sell is 100% brand new, unused, and comes in original manufacturer packaging unless clearly marked otherwise.
Do you offer installation services?
Yes, we offer professional installation services at both of our San Diego Car Stereo locations. Our expert technicians have over 50 years of combined experience to install all of your car, marine, or offroad audio needs. Stop by or give us a call to schedule an appointment to get a quote in person.
