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700W 12" GTi Series Dual 6 ohm Subwoofer

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Buy One, Get One 50% Off on JBL GTi Series Car Subwoofer

Buy One JBL W12GTi-MkII Car Subwoofer at regular price and get 50% Off a second W12GTi-MkII Car Subwoofer! Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.







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JBL Audio Store

Ultimate Woofer

The JBL W12GTi MkII 12-inch (300mm) subwoofer is nothing short of amazing. Using technology from the JBL professional audio division, this sub features the patented Differential Drive Design motor that uses opposed dual voice coils in a neodymium magnetic field and handles an amazing 4,000 watts peak power (700 watts RMS). Other high-tech materials include a cast-aluminum frame, Kevlar cone and nitrile butadiene rubber (NBR) one-piece surround. This sub represents the best 12-inch (300-millimeter) car subwoofer that money can buy. It’s the 12-inch reference standard. Nothing else even comes close.

The Sound of quality

Sonic Electronix, one of the leaders in car audio, recently visited Harman, the premium global audio and infotainment group, at their research and development locations in Northridge, California and Detroit, Michigan. The purpose of these visits was to utilize and combine the powerful brand of Harman and the industry leading knowledge behind Sonic Electronix to begin working together on developing future car audio projects.

General Features:

  • 12" Dual 6 Ohm GTI Competition Level Subwoofer
  • Power Handling:
    • Peak: 4000 watts
    • RMS: 700 watts
  • Impedance: Dual 6 ohm
  • Kevlar paper cone woofer
  • Nitrile-butylene surround
  • Differential Drive Design motor
  • Symmetrical field geometry ensure linear cone travel and low distortion
  • 3" Voice coil
  • Frequency response: 18-1000 Hz
  • Sensitivity: 91 dB
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
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.
4000 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.
700 watts
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
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.
6 ohms
Voice Coil Diameter
Diameter of voice coil, usually measured in inches.
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).
18 - 1000 Hz
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".
91 dB
Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
20.32 mm
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

Round / Circle
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
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.
Kevlar Reinforced Pulp (Paper)
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.
Nitrile Butadiene Rubber (NBR)
Subwoofer Grille
Most subwoofers are able to accommodate a universal grille; however, some subs include a grille and others have a specific, optional grille available for purchase separately. If "yes", then the subwoofer includes a grille. If "optional (sold separately)" the matching grille will need to be purchased in addition to the sub.
Re-Cone Kit Available
Some higher end subwoofers have replaceable cone assemblies. In case of a blown woofer, a recone kit allows for a simple replacement, as opposed to purchasing an entire new subwoofer.

Recommended Enclosure Specifications

Recommended Enclosure Type
This is the recommended type of enclosure that the subwoofer should be installed into. Some subwoofers are specially designed for particular enclosures.

Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.

Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".

Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.

Ported / Vented
Minimum Sealed Box Volume
This value indicates the minimum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.0 cubic feet
Maximum Sealed Box Volume
This value indicates the maximum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.0 cubic feet
Minimum Ported Box Volume
This value indicates the minimum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
2.25 cubic feet
Maximum Ported Box Volume
This value indicates the maximum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
2.25 cubic feet
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 Diameter
The actual diameter of the hole you will need to cut out if you are creating a new mounting location for this speaker, or if you are mounting a subwoofer in a box.
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.


Electromechanical Parameters

Free-Air Resonance (Fs)
The free-air resonance frequency of the subwoofer, measured in Hz. At this frequency the weight of the moving parts is perfectly balanced with the subwoofers suspension system.
31.83 Hz
Equivalent Compliance (Vas)
This is the amount of air that has the same stiffness as the subwoofers suspension. The greater the rating, the lower the stiffness and larger recommended enclosure. It is measured in Liters.
44.75 liters
Total Speaker Q Value (Qts)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including all dimensionless losses. Essentially, a high Qts value (closer to 1.0) means the subwoofer is great for sealed enclosures and a low Qts value (closer to 0) means the woofer is great in vented enclosures. A Qts of around 0.45 means the woofer will work decently in either enclosure type.
Electrical Q Value (Qes)
The subwoofers relative damping (Q) at the resonance frequency (Fs), including electrical losses. Also called the mechanical damping of the subwoofer. The unitless measurement usually varies from 0.5 – 10.
Electrical Resistance of Voice Coil (Re)
Amount of DC resistance of the subwoofer when measured with an ohm meter. Typically, this will read less than the impedance rating of the subwoofer.
3.20 ohms
Mechanical Q Value (Qms)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including mechanical losses. Also called the mechanical damping of the subwoofer. This unitless measurement usually varies from 0.5 – 10.

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


virginia beach, VA


April 27, 2012

wow, what can you say. for starters this sub is rated at 700Watts RMS, but it is quite capable of handling much more! i did contact jbl's tech support and engineering department when i hooked this sub up to my planet audio BB2400.1, i told them that i was sending ~1200 watts to this sub. there response was something along the lines of "oh yeah i know it can handle power." it does get hot but then again this was a subwoofer engineered to take heat. simply put, this is an amazing product. i would recommend this to anyone who is looking for loads of bass in a relatively small package ( it needs 11" mounting depth!). i have had it in ported and sealed boxes built to spec and either way you will be impressed. i hope this review helps and clears up any confusion!

34 of 58 found this helpful

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Killa u

Oahu hi

Subs are bad azz

January 4, 2010

If your looking for sq and spl u got it I have 2 mk2 12s I'm hitting 145dbs with 500 watts each I'm running a jbl bpx 2200 the only thing I don't like is the 3 olm config if it was d2 I could max out these sub with my amp but the new amp I'm getting is gonna fix that problem hopping to get at least 1500 each wit my new amp anyways get dis sub if u wanna shutum down in spl an sq

32 of 55 found this helpful

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Vinny Burrr

Detroit, MI


December 4, 2011

I owned a single JBL GTi for little over a year when i was first starting out. I had it hooked up to a rockford fosgate 800.1 amp, little did i know this subwoofer could handle so much more power. I finally upgraded to a audiopipe ap3000.1 class d amplifier and wow can this subwoofer handle power!! I've been running about 1200 rms though it for a few months, never any burning of the voicecoils or anything, always a very clean sounding sub. Everytime a new person has entered my ride and heard my system they see my massive amp and always ask how many 15's you got back there? You just have to laugh. I'm upgrading to about 6 of these bad boys with 3 of these audiopipe 3000.1 amps. You will probably hear me from where you live. JBL FTW!!!!!

21 of 37 found this helpful

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Great SQ/SPL

March 31, 2011

I upgraded from a 10" Alpine Type X in a ported enclosure to this MkII in a ported, spec'd enclosure powered by an MRP-M1000. I have the gain set about 60% and the low pass filter set at 80Hz. I usually listen to country, rock, and rap at moderate levels, but this sub sounds great even when I want to rage.

Blends beautifully with the front stage, and the response in the ported enclosure seems fairly flat (good thing) and surprisingly quick. Definitely a huge upgrade from my Type X. Remains undistorted even at very loud levels.

31 of 57 found this helpful

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Audio Head

Houston, TX

john paul

May 15, 2010

This SUB is by far the best sub i have worked/heard. i have been an installer for 8+ years now and this sub blows away anything i have worked with JL W7 had 2 of them this one is way better in SQL and SPL have it in a ported enclosure port tuned to 36.5 hz internally braced box with 10+ braces just listen to it or check the reviews

27 of 49 found this helpful

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ya kno who it is



August 22, 2009

i have 4 of these 12" monsters, and all i can say is wow, im glad i didnt get the 4 15"s, i compete at a local audio shop, and im killin the competition, ova here, im hittin 151.9 db, wit the amps cranked half way, im runnin 2, 3000watt powerbass amps, and they can handle way more, if u wanna win comps, this is the subs to buy

34 of 63 found this helpful

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Jon Brown

Sontag, MS


June 28, 2009

JBL is definitely the best in the business. There is a reason their products always hold the top spots at sound competition. I have this sub in a 1.0 cu. ft. box, stuffed, running on a JBL GTO 1200.1 and I must say impressed is an understatement. The clarity and output of this sub in such a small enclosure is simply amazing. The thing reproduces notes so low, you gone need a winter coat. If disappointment plagues your life, it's time to change that. Makes yourself happy. Buy JBL and forget what it means to be let down.

27 of 51 found this helpful

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South Riding, VA

JBL Subwoofer

August 12, 2014

I was looking a subwoofer that would be able to handle all types of music. Previously I have used JB Audio, Infinity, Alpine, Kicker, etc.. Finally, this one is what I was looking. The bass is so powerful and punchy to handle all the hiphop/trance/rock music and it was able to handle low frequency very well for classical pop music. One of the best subwoofer I ever used. I wired as 3 ohms and my amp is pioneer 9601 that can handle 750 watts rms at 3 ohms.

Highly recommended.

23 of 44 found this helpful

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Leesburg, OH

Second to none!

December 28, 2011

I have two of these breathtaking beasts and they are simply flawless JBL doesn't lie when they say the ultimate woofer, sure there are subs out there that can take 3500 rms but this gti doesn't slack when I first got this I didn't have the 2nd one so I hooked it up to my bpx 2200.1 all by it's self and gave it 2200 rms in this small little sealed box I had laying around and it took it for a good half hour, I wouldn't do it often but it will take a lot more than 700 if you have good voltage and no distortion I've got them each in a ported 2.2 cu box now and they are just amazing. Extremely loud super clean really low deep violent brutal bass!!!!

21 of 40 found this helpful

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July 13, 2015

You must first know that you get what you pay for regardless of price. When you chose the top of the line product from JBL, you can expect it to this case...beyond what you expect! JBL has been around from the beginning. There is a reason for their success and longevity. Quality in sound reproduction. I have owned and always buy JBL products, period! I don't get cought up in the advertisement sales verbiage and the hype. Reputation, experience and performance. If you want loud, clear, articulate bass....WGTI won't be dissapointed.

3 of 6 found this helpful

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Fort Worth, Texas

Good Sub

May 5, 2009

I have not had much time with this sub yet other than installing it. The woofer was installed on my boat and our opening weekend is upcoming. From all the tests i have run, this thing is a beast. Its very heavy! Very clean and will give you the sound you need. I recommend..

17 of 39 found this helpful

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San Jose ca


March 31, 2010

I strongly recommend these subs. I put four in an 03 impala upgraded my alternator from Ohio generators. Extreme competition I recommend getting the JBL GTO1400.1 seeing how that amp was meant for those. If you have two use zero gauge monster wire or Fosgate wire nothing else will do these subs justice. I've hit 174.3 at competitions with the meter in the kick panel and the seats up. Heck, I think I may go to 15's in my next car. Beats Rockfords t2 and JL's w7 and hecka cheap compared to both of them. I wish I checked prices here though. No worries, this sub is bangin.

22 of 50 found this helpful

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L7 vs GTi

February 24, 2012

I got two gti's when they first came out and got sick of them blowing out. Then i got 2 L7 12" kickers. Not only have they out lived the gti with same power output but they bank way harder way longer, sound better, etc. Buy this speaker at your own risk and if you do purchase a jbl amp. They last longer and are under rated. I did have those for a while and were cheaper and put out for a long time before they gave up on me. Good luck use your head and go with another brand. Kicker is the way to go there is a reason why they are the hottest seller QUALITY and the higher up you go the biger bang you are going to get. L3, L5, L7, SOLO X, also CVX is sweet!

14 of 36 found this helpful

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Chula Vista, CA


July 10, 2008

After owning several dozen different subwoofers over the past 15 years, I came across the JBL W12GTI MKII and was completely blown away. Unbelievable SQ and SPL in such a small space. Reminds me of the good old days when I had 2 15" Kickers in my back seat and this one sub hit just as hard or harder than those two together! And sound twice as good. I love this sub and am buying this one for myself. Can't wait. The only thing I don't like really is the 3 ohm configuration kind of limits my amplifier use of my Zapco c2k 6.0. I can't get it modded now to 1200 watts like planned.

21 of 52 found this helpful

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Accessory Tools and Products

Accessories added

12" Medium Sealed Subwoofer Enclosure

CARB Compliant, 3/4" MDF Sealed Enclosure Lined with Premium Carpeted Finish

Your Price $47.95

12" Dual Vented Subwoofer Enclosure

CARB Compliant, 1" MDF Dual Vented Enclosure w/ Premium Carpeted Finish

Your Price $179.95

NVX 25 ft. of True Spec 12 Gauge Speaker Wire

100% OFC wire with EnvyFlex metallic jacket insulates and protects against damage from extreme conditions.

Your Price $39.99

25 ft. of Streetwires 12 Gauge Speaker Cable

You'll need speaker wire to hook up that new subwoofer!

Your Price $44.95

Belva 23 ft. of 12 Gauge Speaker Wire

Ultra-flexible PVC blended jacket for easy installation.

Your Price $14.99

40 Square Feet of Sound Dampening Material

Thicker than the competition, complete sound damping kit for entire vehicle! Use for trunk, doors, roof and floor.

Your Price $119.99

Dynamat Sound Dampening Bulk Kit

Did you know sound dampening will reduce those annoying rattles and even increase your SPL?

Your Price $159.99

Stinger Sound Dampening Bulk Kit

Stinger's Roadkill sound dampening series is sure to kill unwanted road noise and rattles! Enough sound dampening for the whole car!

Your Price $99.99

12 oz. Can of Adhesive Spray

Spray adhesive used for adhering carpet to subwoofer boxes without bubbles.

Your Price $6.99

40" x 15 Ft Piece of Premium Un-Backed Automotive Trim Carpet

Durable design for long life-span, available in many colors and shades.

Your Price $39.99

Gold Plated Dual Terminal Banana Plug Connector

Enables an expandable, secure connection accepting up to 8 gauge wire.

Your Price $1.99

2" Universal, Professional Heavy Duty Roller for Sound Damping/Dampening

Universal rubber roller to make it easy to install sound dampening.

Your Price $7.99

Car Stereo and Speaker Installation Tool Kit

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

Your Price $16.99

Xscorpion 9-Piece Nylon Plastic Pry and Chisel Tool Set

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

Your Price $14.99

1mm All Purpose Solder

Solder is all purpose for use on most projects where solder is needed.

Your Price $8.99

12" Protective Waffle Subwoofer Grille

Keep your subwoofer looking amazing while keeping it safe.

Your Price $4.99

Scosche SPL Meter

Monitor the noise level of your new car audio system with this SPL meter measuring from 60-135 dB.

Your Price $21.99

Browse 4 questions and 10 answers
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Why did you choose this?
Sonic Electronix Store
When it comes to sound...who else but JBL lays down the benchmark! Sound quality, durability, the list goes on. I have never been disappointed by JBL and buy nothing but, period! From car to home to home theater...I ROCK THE BEST! JBL! From my father to me the legend lives on! Thanks James B. Lansing!
Philip C on Jun 11, 2015
1 of the very best 12's..subwoofer ever made for car audio. Extremely low distortion.
Kristopher P on Aug 25, 2014
What is the driver displacement value for this subwoofer?
Adam V on Apr 12, 2015
Best Answer: .12 cu ft. THE BEST 12 inch money can buy for under 1K$. loud, perfect accuracy, and all around fantastic. its a shame JBL stopped producing them. i have two of the 15"s version of these last two ever off of techronics. btw this sub is 358$ on there website, but sonix has MUCH better customer service.
Reply · Report · mitch R on Apr 15, 2015
· Add Answer · I Have This Question Too (0)
What amp would be good with this speaker?
David M on Aug 26, 2014
Best Answer: Hello David,

As you will see, as more and more people chime in, there are Many options out there to match with this Subwoofer. It is important that you understand that this Sub has a Dual-6ohm configuration, which means you seek 700w RMS @ 3ohms when wired in Parallel. You will find that No amp will give you a rating at 3ohms so an educated guess is necessary. Essentially, you seek an amp that is giving you ~800w-900w RMS @ 2ohms, so you can land among ~700w RMS @ 3 .

It is no secret that our favorite 'go-to' amp is the NVX JAD1200.1 .

NVX JAD1200.1
Reply · Report · Customer SStaff on Aug 27, 2014
· Add Answer · I Have This Question Too (0)
how much dose speaker weigh?
A shopper on Aug 27, 2014
Best Answer: Hello,

This sub weighed just under 41.00lbs .
Reply · Report · Customer SStaff on Aug 31, 2014
· Add Answer · I Have This Question Too (0)

Product Summary


Model Number






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 W12GTi-MkII

  • JBL W12GTi MKII 12" Bass Demo
  • Harman International: The Pursuit of Great Sound
  • Subwoofer Size Buying Guide