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JL Audio C2-400x

210W 4" 2-Way Evolution C2 Series Coaxial Car Speakers

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List price $159.95

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with warranty A Pair

Order within 23 hrs 33 mins to ship 10/26

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JL Audio C2-400x

210W 4" 2-Way Evolution C2 Series Coaxial Car Speakers


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NVX 25 ft. of True Spec 16 Gauge Speaker Wire

100% OFC wire with a noise eliminating twisted-pair technology to provide crystal clear sound.


Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.


NVX SDDK12 Door Kit

Eliminates speaker panel distortion and reduces door vibration, rattles and squeaks!



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50% off Complete Car Stereo Tool Kit with Purchase!

Save 50% on the Scosche TK12 installation tool kit with select purchase! This kit includes a voltage test light, wire stripper and many other tools you need to install your system! Cannot be combined with any other offer.




JL Audio C2-400x



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Scosche TK12 Car Audio Installation Kit


Special Price $9.49 ($18.99 if purchased separately)

Scosche TK12 Car Audio Installation Kit

12V Car Stereo Installation Kit • Includes Wire Stripper/Cutter, Screwdriver, RCA Cable Runner, Panel Removal Tool, Test Light, and other Installtion Accessories • Perfect for Installing a First Car Stereo

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JL Audio Store
JL Audio Evolution® C2 Coaxial Speaker System
JL Audio Evolution® C2 Coaxial Speaker System

JL Audio Evolution C2 speaker systems deliver an impressive audio performance solution and value. The technology of the Evolution C2 Series has been drawn from JL Audio's experience in woofer and tweeter design. They have been engineered to deliver adequate efficiency while retaining a smooth mid-range response with low-frequency extension. Smoothness of response and the freedom from distortion are factors that make the C2 Series speakers truly one of a kind and enjoyable for everyone, and the resulting product is one that delivers performance for any car audio enthusiast at a price that won't break the bank!

Silk Dome Tweeter

Silk Dome Tweeter

JL Audio C2 tweeters incorporate silk dome diaphragms to deliver smooth high-frequency transitions, on and off axis. Silk is a natural material with inherently good characteristics as a tweeter diaphragm. In addition to being very light in weight, silk exhibits excellent damping properties, which reduces ringing and resonances in the tweeter's passband, leading to a smooth, pleasing high frequency character free from unnatural sibilance or exaggerated brightness. This is why a Silk Dome Tweeter is preferred by many audiophiles for its overall balance.

Extraordinary Linearity and Control

JL Audio Quality, Build and Design

JL Audio Evolution C2 coaxial speaker systems feature mineral-filled polypropylene cones, long excursion capabilities and stamped steel frames. In addition, the woofer design benefits from JL Audio's vast woofer design experience and advanced modeling systems. It is this use of proper high-quality components and advances that allow the speaker to perform better than any other speaker in its price range. The C2-400x, specifically, has a respectable frequency response of 71 Hz - 22,000 Hz, a modest continuous-power handling of 35 watts and a solid efficiency of 84.5 dB, giving it the ability to produce smooth mid-range and highs.

Product Features:

  • 4.0" Evolution C2 Series 2-way Coaxial Car Speakers
  • Power Handling:
    • Peak: 210 watts per pair / 105 watts each
    • RMS: 70 watts per pair / 35 watts each
  • Recommended Power Range: 10 - 50 watts per channel
  • Injection Molded, Mica-filled Polypropylene Cone
  • Butyl Rubber Surround
  • 1.00" Voice Coil on Kapton® Former
  • Symmetrical Roll Spider
  • Ferrite Woofer Magnet
  • 0.75" Silk Dome Tweeter
  • Ferrofluid Cooling/Damping Neodymium Tweeter Magnet
  • Natural Roll-Off Low-Pass, 1st Order High-Pass Filter with Electrolytic Capacitor
  • Black steel mesh grille with satin silver accents Included
  • Two 4" x 6" (100 x 150 mm) Adapter Plates Included
  • Top-mount depth: 1.81"
  • Cutout Dimensions: 3.81"
  • Nominal Impedance: 4 ohm
  • Efficiency: 84.5 dB @ 1 watt / 1 meter
  • Frequency Response: 71 Hz - 22 KHz ± 3 dB
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

  • Priced Per Pair

Check out the JL Audio C2-400x Owner's Manual

Speaker Specifications

This is the manufacturer product line of speakers.
Evolution C2 (JL Audio)
Priced Per
Car Speakers are typically sold in pairs so you will receive 2 speakers for each speaker purchase on speakers marked "Priced Per Pair". If a speaker is marked "Priced Per Each" then the speaker is sold individually and each purchase you make will result in 1 speaker. High-powered tweeters, midrange and full-range pro audio for car speakers are typically sold per each speaker.
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Tweeter Size
Refers to the size of the tweeter. Typically, smaller tweeters produces less output with higher frequency response.
Tweeter Composition
Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Mica Injected Polypropylene (MIPP)
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Butyl Rubber
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
105 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
35 watts
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
84.5 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
71 - 22,000 Hz
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches, required to contain the speaker.
Hi-Res Audio Compatible
This feature refers to if the product is capable of Hi-Res Audio (HRA) playback.
Speaker Grilles
A grating or screen of metal or plastic bars or wires, mounted in front of a speaker as protection. If yes, the speakers will include matching speaker grilles. If no, there are no grilles included.
Number of Speakers
This is the number of speaker that is included in the package. Each purchase will result in receiving the number of speakers indicated here. Please note that some items will have multiple woofers in the same enclosure. For sets of component speakers, this number will refer to the number of sets of speakers (For example, 2 would indicate the purchase includes 2 woofers and 2 tweeters).

Please refer to the product image and description for further details about the speaker.


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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
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Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Fayetteville, NC

Sounds Great

February 6, 2010

Just put in a pair of the JL Audio C2-400X into the dash of my 2000 Porsche Boxster S. and they sound great! I cut the old speakers out to make a mounting bracket. And that work. Overall Sonic Electronix was easy to order from and the speakers sound great.

24 of 29 found this helpful

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Astoria, NY

JL C2 -400X

May 9, 2010

LOOK .I just bought these beauties. My god they rock!! At first I really underestimated them cause they are so light!! The sound is awesome, you can hear a crisp base!! Excellent buy, highly recommend it.

21 of 26 found this helpful

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Jacksonville, FL

JL Speakers on 2011 Hayabusa

April 20, 2014

Just bought and installed JL speakers on my Hayabusa as a replacement for 4" Infinity reference and they out perform reference speaker by far. Using a 2 channel 300 Watt Rockford Fosgate amp to boost the sound and with a little tweeking of the amp they loud with crisp base. Excellent buy!!

17 of 22 found this helpful

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Quality Item

May 16, 2011

After fitting a JL Audio amp & speakers to my Jaguar XKE I added the JL C2 400x to the front console area which is limited in space, the JL's perform beyond their size & price! Sonic Electronix dispatched quickly & efficiently, good service, would definitely use Sonic again

16 of 20 found this helpful

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Boulder, CO

Solid JL Audio C2-400x speakers!!

October 11, 2010

They have great sound and would definitely recommend them. Great speakers for the money!

16 of 20 found this helpful

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Kennewick, WA

Verified Purchase
Dope speakers

December 25, 2015

Overall dope speakers, the sound quality, perferct mid-bass, easy installation (first time i ever installed speakers). Only problem i found was that these are 4" and i seen that i could fit 5.25" speakers for my rear doors.

0 of 0 found this helpful

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Magnolia, TX

Verified Purchase
4" jl audio

November 20, 2015

Ok speakers way over priced. Find something cheaper name doesnt mean anything with these

0 of 1 found this helpful

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Accessory Tools and Products

Accessories added

NVX 25 ft. of True Spec 16 Gauge Speaker Wire

100% OFC wire with a noise eliminating twisted-pair technology to provide crystal clear sound.

Your Price $15.99

25ft. 16 Gauge (AWG) Speaker Cable

25 Feet of true gauge JL Audio speaker wire.

Your Price $17.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $18.99

NVX XTGSP2 Tone Generator and Speaker Polarity Tester

Perfect for safely troubleshooting and testing audio systems

Your Price $29.99

Xscorpion WDCR2 Window and Door Clip Remover

Removes and installs handle and window crank clips.

Your Price $8.99

Encore Universal Four Door Power Door Lock Kit

Add Power Door Locking and Unlocking while you have the Door Panels removed

Your Price $29.99

NVX SDDK12 Door Kit

Eliminates speaker panel distortion and reduces door vibration, rattles and squeaks!

Your Price $47.99

Stinger Roadkill Door Kit

Use this to eliminate rattle from your doors!

Your Price $37.94

NVX Sound Dampening Rubber Roller

Install your Sound Dampening with ease using this heavy duty rubber roller!

Your Price $7.99

4" x 6" to 4" Speaker Adapters

Perfect fit for 4" speakers!

Your Price $7.32

XTC 4" Round Foam Speaker Baffles

Creates a tight, acoustic seal behind the speaker to enhance the sound quality.

Your Price $8.99

16-14 AWG Butt Connectors

These blue butt connectors are ideal when connecting thicker speaker wire your new aftermarket speakers!

Your Price $4.49

16-14 AWG Blue T-Tap Adapters

Allows for fast and easy splicing of wires by easily tapping into the cable.

Your Price $2.58

16-14 AWG Quick Disconnect Connectors

These blue quick disconnect connectors make it easy to connect and disconnect speaker wire your to your new aftermarket speakers!

Your Price $13.26

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Browse 1 question and 2 answers
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Why did you choose this?
Sonic Electronix Store
heard jl was good... hope they are for this price
Al R on Nov 30, 2015
Price and past experience with this type of speaker. They sound great and hold up well.
Richard M on Sep 20, 2014

Product Summary


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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: JL Audio C2-400x