



JL Audio C1-400x
C1 Series 4" 2-Way Car Speakers
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Upgrade Your Car Audio with JL Audio C1-400x – Premium Coaxial Speakers
Enhance your car audio system with the JL Audio C1-400x Coaxial Speakers. Engineered to deliver exceptional audio performance and robust sound quality, these high-quality speakers bring your favorite music to life. Whether you're a daily commuter or an audiophile on a road trip, the JL Audio C1-400x ensures you enjoy every moment with immersive audio.
| Key Feature | Details |
|---|---|
| High-Performance Coaxial Speakers | Designed to provide deep, accurate sound with minimal distortion. |
| 4" C1-Series Coaxial Speakers | Offers superior sound quality and performance in compact size. |
| Optimized Motor Design | Ensures high output and low distortion for crisp sound. |
| High-Quality Construction | Durable components built to last through daily use. |
| Silk Dome Tweeter | Delivers smooth and detailed high-frequency response. |
Advanced Design and Materials
- Efficient Heat Management: Cooling features help maintain peak performance during long listening sessions.
- Rugged Construction: Engineered to withstand the demands of daily driving environments.
- Optimized Motor Structure: Enhances power handling and clarity.
- Polypropylene Cone Woofer: Produces accurate and full-bodied low-end response.
Seamless Integration with Existing Systems
- Universal Compatibility: Designed to work with most OEM and aftermarket head units.
- Easy Installation: Includes wiring options and mounting hardware for fast setup.
- Improved Audio Performance: Elevates clarity, output, and dynamic range.
Durability and Reliability
- Rugged Construction: Built tough for years of dependable performance.
- High-Quality Components: Ensures reliable operation under real-world conditions.
- Advanced Protection: Resists damage from environmental and mechanical stress.
Why Choose JL Audio C1-400x?
- Superior Sound Quality: Enjoy precise, distortion-free playback across all frequencies.
- High-Quality Construction: Long-lasting components engineered for automotive use.
- Universal Compatibility: Integrates easily with a wide variety of audio systems.
- Durable and Reliable: Backed by JL Audio’s reputation for quality and dependability.
Specifications
| Specification | Details |
|---|---|
| Speaker Size | 4 inches |
| Power Handling | 50W RMS |
| Frequency Response | 64Hz–22kHz |
| Impedance | 4 ohms |
| Mounting Depth | 2.01 inches |
| Sensitivity | 86.5 dB @ 1W/1m |
| Compatibility | Universal |
What’s In the Box
- JL Audio C1-400x Coaxial Speakers
- Grilles
- Mounting Hardware
- User Manual
Conclusion
Upgrade your car audio system with the JL Audio C1-400x Coaxial Speakers and experience superior sound quality in a compact and efficient design. Offering powerful performance, easy installation, and proven durability, these speakers are the ideal choice for any vehicle. Drive with confidence and clarity—thanks to JL Audio.
Frequently Asked Questions
-
What makes the JL Audio C1-400x Coaxial Speakers stand out?
The JL Audio C1-400x features 4" coaxial drivers with a silk dome tweeter and optimized motor structure, delivering high-quality sound with minimal distortion. -
Is the JL Audio C1-400x easy to install?
Yes, the C1-400x includes mounting hardware and offers flexible wiring options for simple installation in most vehicles. -
Can the JL Audio C1-400x integrate with any car audio system?
Absolutely. The speakers are designed for universal compatibility with both factory and aftermarket systems. -
Is the JL Audio C1-400x durable?
Yes, its rugged construction and high-grade components ensure long-lasting and reliable performance. -
What are the specifications of the JL Audio C1-400x Coaxial Speakers?
They feature a 4" driver, 50W RMS power handling, 64Hz–22kHz frequency response, 4-ohm impedance, 2.01" mounting depth, and 86.5 dB sensitivity. -
Do the JL Audio C1-400x Coaxial Speakers come with a warranty?
Yes, they typically include a manufacturer's warranty for added peace of mind.

JL Audio C1-400x C1 Series 4" 35W RMS (105W Peak Power Handling) 4 Ohm, 2-Way Coaxial Car Speakers (pair)
The JL Audio C1-400x 4-inch 2-Way Car Speakers deliver high-quality sound at an affordable price, making them an excellent entry point into JL Audio’s renowned performance line. As part of the C1 Series, these speakers offer impressive full-range audio clarity and dynamic sound that far exceeds expectations for their class.
Built with a polypropylene cone and rubber surround, the C1-400x ensures accurate, punchy bass and smooth midrange tones. These durable materials help the speakers maintain their performance even during extended, high-volume listening sessions, minimizing distortion and wear over time.
To handle the upper frequencies, the 0.75-inch aluminum edge-driven dome tweeter produces crisp, detailed highs with minimal breakup, ensuring smooth, balanced audio at every level. The wide dispersion design provides a more immersive and consistent listening experience across your vehicle’s cabin.
With 70 Watts RMS and up to 210 Watts peak power at 4 ohms, the JL Audio C1-400x offers plenty of output while maintaining clarity and control. The frequency response of 64 Hz to 24 kHz and sensitivity of 87.5 dB ensure you’ll enjoy loud, full-bodied sound with minimal distortion — perfect for upgrading your car’s factory speakers.
Key Features
– 4-inch 2-way car speakers from JL Audio’s C1 Series
– Polypropylene cone and rubber surround for accurate, durable bass response
– 0.75-inch aluminum edge-driven dome tweeter for smooth and detailed highs
– Excellent sound dispersion for a balanced in-car listening experience
– Power handling: 70 Watts RMS / 210 Watts Peak (4 ohms)
– Frequency response: 64 Hz – 24 kHz
– Sensitivity: 87.5 dB
– Delivers clean, powerful sound with minimal distortion
What's Inside?
- 2-way speakers
- 3/4" Screws (#8)
- Speed clips
- 0.187" Crimpable female quick slides
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.
