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Image Dynamics CTX-4

200W Peak (100W RMS) 4" 2-Way CTX Series Coaxial Car Audio Speakers

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Image Dynamics ID4

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Image Dynamics CTX-4

200W Peak (100W RMS) 4" 2-Way CTX Series Coaxial Car Audio Speakers


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NVX SDSK2 Speaker Kit

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The Affordable Solution for the Autosound Enthusiast:

For those seeking out the industry's most affordable and well balanced speakers, consider the Image Dynamics CTX4. The CTX series offers incredible acoustic detail and beautiful tonal qualities that is rarely found in speakers of the same price range. Whether you are planning on powering the speakers directly off of the car stereo or with an aftermarket amplifier, the Image Dynamics CTX4 coaxial speakers will handle the power gracefully.

Image Dynamics CTX speakers have been carefully designed, meticulously engineered, and properly built with ideal materials. The final result is a well balanced speaker that sound brilliant in just about every installation. Experience the CTX sound today!

General Features:

  • 4" CTX Series 2-Way Car Speakers
  • Power Handling:
    • Peak: 200 watts per pair / 100 watts each
    • RMS: 100 watts per pair / 50 watts each
  • Recommended power range: 15 - 55 watts RMS
  • Mica-Polymer cone
  • Butyl rubber surround
  • Silk dome tweeter
  • High-energy neodymium tweeter magnets
  • 4 ohms impedance
  • High temperature and high power voice coil
  • Sensitivity: 87 dB
  • Frequency Response: 100-22,000 Hz
  • Top-mount depth: 1-15/16"
  • Also found as: CTX 4
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Priced Per Pair

Product History:

Image Dynamics ID4 thumbnail
(newest, current model)
Image Dynamics CTX-4 thumbnail
(previous model, replaced by Image Dynamics ID4)

Speaker Specifications

This is the manufacturer product line of speakers.
CTX (Image Dynamics)
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 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.
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.
100 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.
50 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".
87 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).
100 - 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.
Bottom-Mount Depth
The depth when installed from the bottom of the mounting surface. Measured from the bottom of the speaker's magnet to the top of the mounting holes on the rim of the speaker.
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches or millimeters, required to contain the speaker.
3-5/8" x 3-5/8" 
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.


Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating

Terry H

Saint Charles, MO

Very good 4 inch speakers!

January 8, 2014

I bought a set of these back in November to go along with a set of Image Dynamics CTX65cs comps. These CTX4 coaxials blend in so well with the 6.5 that I forgot I had them so I never wrote a review until now. To really tell how they sound I had to fade my system to the rear and when I did I found that these sounded almost as good as the larger front speakers (just lacking the mid bass) but 4 inch speakers normally don't produce the 60 to100hz range anyway. So to sum it up, if you have factory 4 inch speakers in the rear and you want to upgrade your rear fill, then get these and you will never buy another set. Yes, they sound that good.

21 of 25 found this helpful

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Best speakers made!

December 25, 2012

These 4" image dynamics are one of a kind...i have an 88 2 door toyota pick up with 2 10" shallow mount MB quart subs.. 2 6.5" Image dynamics chameleons in fiberglass kickpods in the front- all powered on a 600watt crossfire amp with clarion DRX-9255 head unit...though this system all read packs a punch all i was missing was a little more tweet and mid bass...the 4" image dynamics ctx-4 did the job perfectly..i put them in the factory slots in my dash facing the riders and they sound amazing...they dont need any capacitors or bass removers because these small speakers "slam" iv personaly never heard any 4" speaker louder...not only this but the speaker sounds extremly distortion what so ever...i would highly recommended the this speaker to anybody who appreciates good sound...the quality of speaker I would compare this to is sounds amazing! I highly suggest buying these 4's or any image dynamics product!

19 of 23 found this helpful

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Takoma Park, MD

Oh the beauty of audiophile sound at such an amazing price!

October 8, 2011

I have a 2002 Subaru Forester. While the front panels are 6.5", they decided to be evil and make the rear panels 4". Then they went a step further and placed them so you can't install larger speakers with out dropping some serious cash on a custom install. Never fear, SonicElectonix and Image Dynamics to the rescue!

Audio Quality: Simply put these speakers sound beautiful. I was originally going to get the DLS Performance 124s, but after my offer of $50 for the Image's was accepted, my choice was easy. What these speakers lack in bass (as expected from 4 inchers) they more than make up for in mids and highs. The silk dome tweeters are adjustable (although if you have to use the grill like I do, they can't be angled up as far as I would like) and sound amazing. I have Polk Audio db series speakers in the front and frankly, music sounds better in the back.
Construction: The poly-mica woofers feel exceptionally durable and man oh man does that silk make all the difference in the world.
Frequency Response: Really exceptional for 4" speakers. Nothing in the price range can come close to handling what the amp/head unit throws at it. Also the built in bass blockers are
Power Handling: Again, At the price I paid you're looking at 30-35 RMS average load, but with the CTX-4s you get a nice meaty 50. Perfect for my amp (also I was assured by the wonderful tech support agent that 50 was lowballing and they can handle much more).
Price: Rocks. Nuff said.

Cons: They are 4" speakers. But that can't be helped (the car that died on my had Inifinity Kappa 929.1s on the rear deck so hiphop just isn't the same).
The tweeter can't be angled as high as I would like with the speaker grill on. (I'm really searching for cons here)
Silk tweeters are delicate and won't last as long as ones made from other materials. Oh well, that just means I'll get to go through the joy of picking out another amazing product fron sonicelectronix!
Design: The grills look kinda silly. Again, I'm reaching here.

Overall: I would recommend these speakers to ANYONE stuck with 4inchers. My set up (Alpine Head, Alpine Power Pack (soon to be installed DLS or Focall 6.5" front pane)l and Image Dynamics CTX-4's in the back cost me around $400 total in parts, and aside from Subaru's strange connecters for the rear speakers that required my friends help, total install time was less than an hour. In my humble opinion the Images fit right in.

Purchase with confidence.

20 of 25 found this helpful

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lake elmo, mn

nice speaker

September 17, 2013

Well constructed, nice upper midrange and smooth, not too shiney highs. Recommended.

18 of 22 found this helpful

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Great Value!

April 17, 2012

This small speakers have a crisp and clear sound and they also have a great price!

18 of 22 found this helpful

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Accessory Tools and Products

Accessories added

Streetwires 50 ft. of True Spec 16 Gauge Speaker Wire

You need speaker wire to connect your speakers!

Your Price $24.99

Belva 23 ft. of True Spec 16 Gauge Speaker Wire

100% Copper Clad Aluminum, PVC blended jacket for easy installation and high strand count for maximum audio quality

Your Price $12.99

Car Stereo and Speaker Installation Tool Kit

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

Your Price $20.99

NVX XTGSP2 Tone Generator and Speaker Polarity Tester

Perfect for safely troubleshooting and testing audio systems

Your Price $19.99

Belva Five Piece Installer's Panel Removal Tool Kit

Easily removes dash/trims, door clips, panels and pins, rubber grommets and vehicle emblems.

Your Price $13.99

Xscorpion WDCR2 Window and Door Clip Remover

Removes and installs handle and window crank clips.

Your Price $8.99

Universal Wire Puller & Grabber

Running wires has never been easier! This wire puller allows you to run wires through those hard to reach places!

Your Price $7.99

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 SDSK2 Speaker Kit

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

Your Price $14.99

Stinger Roadkill Speaker Kit

Use this to eliminate rattle from your speakers!

Your Price $10.99

NVX Sound Dampening Rubber Roller

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

Your Price $7.99

XTC 4" Round Foam Speaker Baffles

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

Your Price $7.99

16-14 AWG Butt Connectors

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

Your Price $6.99

16-14 AWG Blue T-Tap Adapters

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

Your Price $12.99

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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• RMS Power: 90W
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Browse 1 question and 3 answers
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Why did you choose this?
Sonic Electronix Store
I chose this to compliment the CTX-65cs set that I have. Those are amazing and I expect these to be as well.
Edward C on Dec 8, 2016
I saw a good video on youtube and Car audio forum members sing absolute praises about these CTX speakers for their performance for the money. Gonna use these to try out 4 inch A pillar pods.
jeff h on Aug 15, 2015
Power in a small size
Samuel J on May 27, 2016

Product Summary


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Internal Product ID


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: Image Dynamics CTX-4