JL Audio C2-400X Evolution C2 Series 4" 35W RMS (105W Peak Power Handling) 4 Ohms, 2-Way Car Coaxial Speakers (Pair)
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What's Inside?
- • (2) 4" 4 Ohm, 2-Way Car Coaxial Speakers
- • (2) Grilles
- • (2) 4x6 adapter brackets
- • (8) Self-tapping screws (#8 x 1-3/8")
- • (8) Speed clips
- • (4) Self-tapping screws (#8 x 8mm)
- • (2) Crimpable female quick slides (0.205"/5.2mm)
- • (2) Crimpable female quick slides (0.11"/2.8mm)
- • (2) JL Audio logo grille badges
- • Paper template
- • Owner's Manual
Why Choose JL Audio C2-400X Coaxial Speakers
Clear Sound and Powerful Performance
The JL Audio C2-400X 4-inch coaxial speakers deliver the clean, dynamic sound that JL Audio is known for. Featuring a durable mica-filled polypropylene woofer and butyl rubber surround, these speakers provide accurate mids, smooth response, and impressive performance for factory or aftermarket audio systems.
Smooth Highs and Detailed Audio
Equipped with a 0.75-inch silk dome tweeter and built-in crossover network, the C2-400X produces crisp highs, detailed vocals, and balanced sound throughout the frequency range. The included mounting adapters make installation quick and easy in many vehicle applications.
High Efficiency and Reliable Power Handling
With 35 watts RMS, 105 watts peak power handling, and a frequency response of 71 Hz–22 kHz, the JL Audio C2-400X delivers excellent clarity and long-lasting reliability. These premium 4-inch car speakers are an ideal upgrade for drivers seeking better sound quality without sacrificing efficiency.
JL Audio C1-400X vs C2-400X | Which 4-Inch JL Audio Coaxial Speaker Is Best?
| JL Audio 4-Inch Coaxial Speaker Comparison |
JL Audio C1-400X
4" 2-Way Coaxial Speaker System
BEST VALUE
- • 4" Coaxial Speakers
- • 35 Watts RMS
- • Aluminum Edge-Driven Dome Tweeters
- • Built-In Crossover Network
- • Excellent Factory Speaker Replacement
- • High Efficiency Design
- • Great Performance on Factory Radios
- • Most Affordable JL Audio Option
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JL Audio C2-400X
4" 2-Way Coaxial Speaker System
BEST SOUND QUALITY
- • 4" Coaxial Speakers
- • 35 Watts RMS
- • Silk Dome Tweeters
- • Built-In Crossover Network
- • Smoother High Frequencies
- • Improved Midrange Accuracy
- • Premium Factory System Upgrade
- • Better Long-Term Listening Experience
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Quick Buying Guide
Choose the JL Audio C1-400X if: You want the best value, are replacing factory speakers, and plan to power them directly from a factory or aftermarket head unit.
Choose the JL Audio C2-400X if: You prioritize sound quality, smoother highs, better vocal reproduction, and may add an amplifier in the future.
Bottom Line: Both speakers handle 35W RMS and work well as factory replacements, but the C2-400X delivers noticeably smoother and more refined sound quality thanks to its upgraded silk dome tweeter and improved woofer design. The C1-400X remains the better budget-friendly choice.
JL Audio C2-400X Recommended Amplifiers | Best 4-Channel Amp Pairing for Maximum Clarity & Speaker Performance
JL Audio C2-400X Amplifier Matching Guide
Best 4-Channel Amplifiers for Improved Clarity, Higher Output & Better Overall Sound Quality
Amplifier Matching Overview
C2-400X Power Rating: 35W RMS Per Speaker
Speaker Type: 4" 2-Way Coaxial Speaker System
Recommended Amp Range: 10W – 50W RMS Per Channel @ 4Ω
Ideal Power Target: 35W – 50W RMS Per Channel @ 4Ω
Goal: Cleaner sound, improved detail, greater dynamic range, and higher volume capability with reduced distortion
Top Recommended Amplifiers for JL Audio C2-400X
JL Audio JD400/4: Best overall recommendation. Produces 75W RMS per channel and can be tuned safely to match the C2-400X. Offers excellent sound quality, reliability, and future upgrade flexibility.
JL Audio XDM400/4: Marine-grade 75W RMS x 4 amplifier designed for boats, powersports, and outdoor applications. Delivers clean, dynamic sound with exceptional durability.
Kicker KEY200.4: Produces 50W RMS per channel and includes built-in DSP with automatic tuning. Excellent for factory radio integration and an ideal power match for the C2-400X.
Amplifier Power Guide
Factory Radio Only: 15W – 20W RMS Per Channel
Mild Upgrade: 25W – 35W RMS Per Channel
Ideal Match: 35W – 50W RMS Per Channel
Maximum Recommended: 50W RMS Per Channel
Gain & Tuning Recommendations
Gain Setting: Set amplifier output to approximately 35W RMS per speaker or slightly higher with clean signal headroom.
High-Pass Filter (HPF): 100Hz – 120Hz when paired with a subwoofer.
HPF Without Subwoofer: 80Hz – 100Hz to protect the 4-inch woofers while maintaining balanced midbass response.
Bass Boost: Avoid excessive bass boost to maximize speaker longevity and reduce distortion.
EQ: Start with a flat EQ and make minor adjustments after listening.
Recommended System Pairings
Simple Factory Upgrade: C2-400X + Factory Radio
Daily Driver Upgrade: C2-400X + Kicker KEY200.4
Balanced JL Audio System: C2-400X + JD400/4 + W0v3 Subwoofer
Premium Sound Quality Build: C2-400X + XD400/4v2 + W3v3 Subwoofer
Marine & Powersports System: C2-400X + XDM400/4
Why Amplify the JL Audio C2-400X?
Cleaner Sound: Dedicated amplifier power reduces distortion compared to factory head units.
Improved Detail: The silk dome tweeters sound clearer and more dynamic with additional power.
Higher Output: Play louder while maintaining control and sound quality.
Better Overall Performance: Improved clarity, balance, and listening enjoyment across all volume levels.
Pro Tip: While the JL Audio C2-400X is rated at 35W RMS, many installers pair it with 50W–75W RMS amplifiers such as the JD400/4, XD400/4v2, or XDM400/4. Proper gain adjustment provides additional headroom, cleaner dynamics, and significantly improved sound quality without risking speaker damage.
Frequently Asked Questions (FAQ)
- • Why do my JL Audio C2-400X speakers sound weak or lack bass? The C2-400X is designed for accurate midrange and high-frequency reproduction rather than deep bass output. Because of their compact 4-inch size, these speakers perform best when paired with a dedicated subwoofer. If you're looking for stronger low-end response, consider adding a subwoofer and setting the speakers to a high-pass crossover.
- • Do the JL Audio C2-400X speakers need an amplifier? No, the C2-400X can operate from factory radio power, but many users notice significantly improved clarity, detail, and overall output when powered by an external amplifier. A quality amplifier delivering 35W–50W RMS per channel allows the speakers to perform at their full potential.
- • Why do my C2-400X speakers distort at high volume? Distortion is commonly caused by clipped amplifier signals, excessive bass boost, or low-frequency content being sent to the speakers. Setting a high-pass filter between 80Hz and 120Hz helps protect the speakers while improving clarity and reducing distortion.
- • Are the JL Audio C2-400X speakers a direct replacement for factory speakers? In many vehicles, yes. However, some installations may require speaker brackets, adapter plates, or minor modifications depending on the vehicle. Always verify fitment before installation.
- • Why do my new C2-400X speakers have less bass than my factory speakers? Many factory systems artificially boost midbass frequencies to compensate for limited power. The C2-400X focuses on accurate sound reproduction, cleaner vocals, and better detail. Once properly tuned and amplified, most users find the overall sound quality superior to factory speakers.
- • Will the JL Audio C2-400X improve my factory audio system? Yes. Owners commonly report noticeable improvements in vocal clarity, instrument separation, and high-frequency detail. For the best results, pair the speakers with a quality amplifier and subwoofer.
- • What amplifier works best with JL Audio C2-400X speakers? Popular amplifier pairings include the JL Audio JD400/4, JL Audio XD400/4v2, JL Audio XDM400/4, and Kicker KEY200.4. These amplifiers provide clean power and excellent headroom while remaining safe for the C2-400X when properly tuned.
- • What crossover settings should I use for the C2-400X? Most installers recommend an 80Hz–100Hz high-pass filter when no subwoofer is present. If a subwoofer is installed, a 100Hz–120Hz high-pass filter often produces the cleanest results while protecting the speakers from low-frequency strain.
- • Is the JL Audio C2-400X better than the C1-400X? Yes. The C2-400X features upgraded components, a silk dome tweeter, and a more refined crossover design. Compared to the C1 series, most listeners hear smoother highs, greater detail, and a more natural overall sound signature.
- • Do JL Audio C2-400X speakers require a break-in period? Like many premium speakers, the C2-400X may sound slightly smoother after several hours of use. Most users report optimal performance after 10–20 hours of normal listening.
- Diameter : 4 Inch
- Sensitivity : 84.5 dB
- Impedance : 4 Ohm
- Frequency Response : 71-22000 Hz
- Peak Power Handling : 105 Watts
- Design : 2 Way
- RMS Power Handling : 35 Watts
Features:
- Precision Sound: Engineered to reproduce subtle musical elements like delicate woodwinds and soprano vocals, as well as deep bass and powerful drum sounds.
- Speaker Model: C2-400X 4" speakers with rugged polypropylene cones and rubber surrounds for distortion-free handling of high power.
- Silk Dome Tweeters: 3/4" silk dome tweeters provide smooth high frequencies, enhancing realism in your soundstage without causing ear fatigue.
- Full-Bodied Tones: Capable of delivering full-bodied tones across the frequency range.
- Built-in Crossovers: Ensures tweeters and woofers handle designated frequencies, optimizing musical playback.
- Versatile Installation: Includes a pair of grilles for custom installations and adapters for fitting speakers into 4"x6" openings, enhancing installation flexibility.
Specifications:
- Speaker Size: 4
- Design: 2-way
- Tweeter Design: Dome
- Impedance (Ohms): 4
- Tweeter Composition: Silk
- Woofer Composition: Mica-filled Polypropylene
- Woofer Surround: Butyl Rubber
- Sensitivity (1W at 1 meter): 84.5
- Sensitivity at 2.83 volts: 87.5
- Frequency Response: 71 - 22k Hz
- Minimum RMS Wattage: 10
- Maximum RMS Wattage: 35
- Peak Power Handling (Watts): 105
- Top-mount Depth (Inches): 1 15/16
- Bottom-mount Depth (Inches): 1 15/16
- Cutout Diameter or Length (inches): 3 3/4
- Mounting Height (Inches): 0.55
- UPC: 699440996129
- Weight: 5
- Authorized Internet Dealer
Warranty: 2 Year(s) Warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to OnlineCarstereo.com for repair within 1 year from the original date of purchase with proper return authorization.
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Write a review!
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Used them to replace the speakers in my audi quattro, they are night and day better than the old speakers and are better than my Pioneer 4" speakers but I feel that there is still a bit of harshness in some of the higher frequencies. A better eq from the radio or an external crossover may help but ive decided to switch to a component set of speakers. Overall still a good speaker just not quite the sound im looking for
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180 degrees better than my old stereo had them replaced hust the other day
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Tiny but high-quality speakers. Sounds awesome right out of the gate. Bought one pair years ago for my Camaro and have bought again a new set for my Bronco.
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I up graded these from my Kicker KS series 4" speakers. They are not as bottom focused and definitely more balanced throughout the frequency range. Definitely an upgrade.
