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(2) JBL GTO1214D 12" Car Subwoofers with Dual 12" MDF Sub Box Enclosure

Perfectly matched! 2 of the Best Engineered GTO Subs with a Matching Sealed Box! Perfect Specs!

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(2) JBL GTO1214D 12" Car Subwoofers with Dual 12" MDF Sub Box Enclosure

Perfectly matched! 2 of the Best Engineered GTO Subs with a Matching Sealed Box! Perfect Specs!


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Car Stereo and Speaker Installation Tool Kit

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JBL Audio Store

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 4 ohm Grand Touring Die-Cast Series Subwoofer
  • Power Handling:
    • Peak: 1400 watts
    • RMS: 350 watts
  • Impedance: Dual 4 ohm
  • Polypropylene cone woofer
  • Rubber surround
  • Tinsel wire protector
  • Die-cast aluminum basket
  • 2" Dual 4 ohms voice coil
  • Frequency response: 23-400 Hz
  • Sensitivity: 93 dB
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

General Features:

  • Dual Sealed 12" Enclosure
  • Internal box volume: 2.46 cubic ft. total air space - 1.23 cubic ft. per chamber.
  • High Quality 3/4" MDF Construction
  • Durable black carpeting
  • Pre-lined with Poly-Fil
  • Seams are fully caulked for better efficiency
  • 2 Separate chambers allowing each subwoofer its own air space
  • Gold post terminals for clean and easy wiring access
  • Box Dimensions: 28-1/2"L x 14-1/4"D x 14-1/4"H
  • 30 Day return policy

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.
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.
4 ohms
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.
350 watts
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.
1400 watts
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.
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".
93 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).
23 - 400 Hz
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.
14.50 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

Enclosure Specifications

Box Type
Represents the style of the enclosure. Be sure to purchase the appropriate enclosure type and internal volume that will be compatible with your subwoofer's recommendation.

Sealed - Sealed boxes are those that have no holes or vents in it. The only hole in a sealed box is where the subwoofer is installed. Smaller sealed boxes require more power than a larger sealed box. They provide a tight, accurate bass, while the larger sealed enclosures provide a "boomier" and louder bass.

Ported / Vented - Ported/Vented Enclosures provide an even boomier, louder bass, but less accurate then a small, sealed box. Ported enclosures typically require more airspace per sub and also less power output from an amplifier to perform correctly.

Bandpass - Bandpass enclosures make subwoofers perform efficiently, but loose. The bass is not as "boomy" as a ported enclosure nor as punchy as a sealed enclosure. Bandpass enclosures work well with lower to mid-level subwoofers.
Number of Subs/Speakers
This value represents the number of speakers or subwoofers that the enclosure accommodates.
Box Style/Shape
The box style or shape refers to the actual shape of the box. Square and rectangular boxes are straight-edged boxes on all sides, whereas hatchback and truck style enclosures feature an angled front or back design that allows for installation in places short on depth such as single cab pickup trucks. You can also use such enclosures in hatchback cars or other vehicles where space is a premium. Tube and cylinder shaped boxes were made popular by Bazooka and are a great option for those looking for a nice amount of bass without sacrificing lots of space. They may even fit in locations that slim truck boxes cannot fit in. If the enclosure is vehicle specific, we encourage you to read the product description to find out which vehicles the enclosure is made for.
The height of the item, measured from top to bottom, in inches.
The width of the item from left to right (side-to-side) measured in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
Wood Thickness
The thickness of the wood the enclosure is made of, measured in inches.
Number of Terminals
The number of terminals the enclosure has. Each terminal represents 1 positive and 1 negative.
Terminal Type
Spring clip terminals work best with bare wire connections with small-gauge speaker wire, or pin-type connectors.

Binding post terminals are a sturdier, more versatile type of speaker terminal. Because binding post terminals are are threaded, you can tighten them down against the wire or connector for a tight, clean connection. The most popular style of binding post terminals is known as a "5-way binding post". This type can accept bare wire, or any of the common speaker wire connectors. Binding posts with the option to be used with banana clips are even more versatile

Spring posts are a hybrid of the two. Instead of using a thread and "screwing" them tight, they use a spring to allow the wire to fit and tighten against the terminal.

Binding posts (banana clip ready)
Box Exterior Color
The color of the enclosure's exterior/outer finish.
Box Finish
The material used on the outside of the box. Most boxes are carpeted to prevent exterior scratches; however vinyl is popular as it can often be color-matched to a near exact look of your leather factory interior.

Specials with this Item

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Warranty and Return Policy

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

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Accessory Tools and Products

Accessories added

NVX Speaker Wire (XWS1225)

25 ft. of True 12 Gauge EnvyFlex Speaker Cable/Wire (100% Oxygen-Free Copper)

Your Price $39.99

NVX Sound Dampening Trunk Kit (SDTK20)

20 Square Feet of Sound Dampening Material (Five 18" x 32" Pieces)

Your Price $53.99

NVX Sound Dampening Rubber Roller (SDRLR1)

Universal, Professional Heavy Duty Roller for Sound Damping/Dampening

Your Price $7.99

Car Stereo and Speaker Installation Tool Kit

Complete Car Stereo Tool Kit, Includes Voltage Test Light, Wire Stripper and More

Your Price $18.99

Browse 5 questions and 9 answers
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Why did you choose this?
Sonic Electronix Store
The price is outstanding for the value. I've researched budget SQ subwoofers, and the GTO's can't be beat for the price. Very excited to get these installed and begin tuning my new system!
Christopher A on Jun 23, 2015
Amazing sale, awesome deal, great product.
Kevin C on Dec 7, 2014
Good specs/performance for the price.
Andrew Z on Jun 14, 2015
Great deal
Keith C on Nov 27, 2014
why is everyone using mono amps i thought these were dual drivers? it shows 2 hook ups in the back. Cant you just use a 2 channel or 4 channel bridged amp? id like to get these when they come in i have an extra pioneer gm d8604 amp which would bridge at 300 watts rms/ 4ohms a channel x2/ 600 max x2. Is this a good option for me or no?
jeff A on Mar 9, 2015
Best Answer: Hello Jeff,

'Everyone' is using Monoblocks because they are the amps built specifically for subwoofers. Using a Full Range Amp (i.e. a 2-Channel & 4-Channel) isn't "wrong" but it isn't very practical either. In addition, the GTO1214D are Dual-4ohm drivers, which means they CANNOT be wired to a 4ohm load, it is impossible, and therefore should NOT be wired up to an amp that has been bridged. The 2-Channel idea is ok, but, again, not very practical. Going with a 2-Channel means you are paying for a Full Range of performance that you will NOT get because you are obligated to set the crossover to cut out anything above ~80-200Hz.
Reply (1) · Report · Customer SStaff on Mar 10, 2015
· Add Answer · I Have This Question Too (0)
Are these 350 each or 175 each??
A shopper on Feb 18, 2015
Best Answer: Hello,

The drivers are 350w RMS EACH.

Reply · Report · Customer SStaff on Feb 18, 2015
· Add Answer · I Have This Question Too (0)
Best amp for under $120? Can you give me three choices that would work Flawless with these subs.
Mitch S on Feb 2, 2015
Best Answer: Hello Mitch,

The only product in that price range that will provide the needed figures, is the Hifonics ZRX1200.1D. We would much rather you save up for the Pioneer GM-D8601, however, as it is a far better performing amplifier.
Hifonics ZRX1200.1D
Hifonics ZRX1200.1D
Pioneer GM-D8601
Pioneer GM-D8601
Reply · Report · Customer SStaff on Feb 2, 2015
· Add Answer · I Have This Question Too (0)
What's the best amp to match this sub setup? I want it to be clean and true RMS per channel.
Mark C on Jan 23, 2015
Best Answer: Hello Mark,

Two JBL GTO1214D will be asking for ~700w RMS @1ohm (Parallel) or @4ohms (series/parallel) . The "best amp" , in our opinion, would be the RE Audio USX-65KV.1 @4ohms. However, this may be way overkill for a modest setup, so instead we'll suggest some "proper amps". Of which, will be the Pioneer GM-D8601 , Cerwin-Vega H41500.1D, and Rockford Fosgate R750-1D. (all @1ohm)

(Note: you didn't give us very much to work with, so we aren't sure what your budget or preferences are. So, feel free to resubmit with far more details than what you did provide, if none of the suggestions work for you.)
Rockford Fosgate R750-1D
Rockford Fosgate R750-1D
Pioneer GM-D8601
Pioneer GM-D8601
RE Audio USX-65KV.1
RE Audio USX-65KV.1
Cerwin-Vega H41500.1D
Cerwin-Vega H41500.1D
Reply · Report · Customer SStaff on Jan 24, 2015
· Add Answer · I Have This Question Too (0)

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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: (2) JBL GTO1214D 12" Car Subwoofers with Dual 12" MDF Sub Box Enclosure