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4" 2-Way GTO Grand Touring Series Coaxial Car Audio Speakers


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OUR PRICE: $119.95

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4" 2-Way GTO Grand Touring Series Coaxial Car Audio Speakers


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Car Stereo and Speaker Installation Tool Kit

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NVX SDSK2 Speaker Kit

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



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The Sound of Quality

With the long history of professional audio equipment manufactured my JBL, it is no surprise that the Grand Touring Series (GTO) produce some of the finest sound available for car speakers. By integrating the majority of JBL's top car speaker technology, these speakers are able to effectively deliver truly stunning audio, while keeping the price affordable for everyone. For those that are looking for a quality car speaker that will not only sound great, but also keep more money in your pockets. Put your trust in JBL and these Grand Touring Series speakers.


General Features:

  • 4" Grand Touring Series 2-way Car Speakers
  • Power Handling:
    • Peak: 210 watts per pair / 105 watts each
    • RMS: 70 watts per pair / 35 watts each
  • Plus One cone material
  • Mylar/titanium composite dome tweeters
  • Frequency response: 90-20,000 Hz
  • 2 ohms impedance
  • Sensitivity: 90 dB
  • Cutout dimensions: 3-1/2"
  • Top-mount depth: 2"
  • Also found as: GTO-428
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Priced Per Pair

Product History:

JBL GTO429 thumbnail
(newest, current model)
JBL GTO428 thumbnail
(previous model, replaced by JBL GTO429)
JBL GTO427 thumbnail
(previous model, replaced by JBL GTO428)

Speaker Specifications

This is the manufacturer product line of speakers.
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.

Mylar/Titanium Hybrid
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.
Plus One
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".
90 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).
90 - 20,000 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.
2 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 or millimeters, required to contain the speaker.
3-1/2" x 3-1/2" 
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.

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

Blue Knight

Moretown, VT

Excellent Speaker

July 6, 2014

I bought these along with the 528's as re-placements for my MTC...Because they are 2 OHM they effectively double the power of my head unit which is stock....( and cannot be re-placed )....I have gone to full volume with these without them distorting , which I find amazing.

17 of 20 found this helpful

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Antioch, IL

Exceeding my expectations

June 23, 2014

I dropped four of these into my 2009 328i - couldn't believe how bad the stock speakers were. Amazingly bad.

I have always been impressed with JBL speakers and thought at this
price, I would give them a try. Best $100 I have spent in a long time. I can even play the system at the maximum volume w/o any distortion. That is more a function of the head unit / amp, but either way I am sure the speakers will last a long time because of this compatibility.

I did have to get a little creative with mounting, but nothing I wouldn't do again.

16 of 19 found this helpful

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Joe Iudice

Massapequa, NU

JBL GTO Speakers

January 31, 2014

I own a 2010 BMW E90, great car but the BMW Professional sound system is awful, especially the rear deck 4 inch factory woofers (BMW bean counters took out all the tweeters and the amp on this car in 2010). One of my factory rears was crackling, and degrading the sound to the point where I couldn't stand listening. Rather than have BMW (under warranty) replace the poor factory speakers with new poor factory speakers, I selected the JBL's because they are 2 ohm (like my OE), and coaxial. They arrived fast, looked very well made, and installed easily (when I took out the OE, both sides had the magnet and voice coil separating from the plastic cage). The JBL's sound great, clear high's and mids (even though the head unit sends high pass signal only to rear). The whole car sounds "acceptable" now thanks to the rears being better. Cant wait to work on the fronts speakers next, but this fix gives me time to do it right.

16 of 20 found this helpful

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jbl gto 428

December 30, 2011

Great speakers louder than others bench tested, including MTX and BOSS.

14 of 17 found this helpful

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sick vic

nor cal

need some screws

July 24, 2012

No hardware...screws or clips...spent 3 days trying to find some...good thing is the speakers are excellent...Grilles are overstated...

12 of 14 found this helpful

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san luis obispo, CA

Working Great

May 24, 2010

I got these because I needed some 2 ohm speakers to replace some broken bose speakers. They are working great. Sound better than the $440 bose replacements the audi dealer wanted me to buy. It would have been nice if they had made another 4 attachment tabs around the edges to better match my asymmetric audi door mounts but that's not realistic.

13 of 16 found this helpful

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Palestine, TX

great speakers

July 25, 2011

Excellent sound and even better price

11 of 14 found this helpful

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Des Plaines, IL


December 13, 2012

First JBL product I've personally used I was very satisfied with the clarity from such a small 4 inch speaker I would suggest buying these if your in the market for such a speaker

11 of 15 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 $17.99

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 $15.99

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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• Peak Power: 120W
• RMS Power: 60W
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Browse 2 questions and 10 answers
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Why did you choose this?
Sonic Electronix Store
I bought these as replacements for the factory tweeter on my Renault van being 2 ohm they should be louder than the originals giving me some more top end head room
orville d on Jan 30, 2015
I have always been a fan of JBLs sound and when I set out to build a quality sound system I chose this JBL speaker.
charles m on Oct 21, 2014
Grills will match my car's interior better than other brands that look cheap and gimmicky.
Peter T S on Nov 13, 2014
Good price for a quality brand
kristin w on Sep 10, 2014
Are they water proof?
A shopper on Dec 2, 2014
Best Answer: Speakers use voltage to drive them voltage and water don't mix
it also depends on what you want to do with them as well
I don't think there is an easy answer maybe ask JBL direct
I personally wouldn't put any speakers near water but that's my choice
Reply · Report · orville d on Dec 2, 2014
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Product Summary


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Internal SKU


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: JBL GTO428

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