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JBL GT5-1202BR

Ported enclosure with one 12" GT5 subwoofer

Item #: 10951202BR

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2 Reviews | 1 question - 1 answer


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JBL's GT5-1202BR loaded 12" sub enclosure adds a blast of bass to your vehicle so you can really feel your music as you drive. JBL tunes this bass system in an in-car environment for tight, responsive low notes.

Unique port for compact design
The enclosure features JBL's unique Slipstream port, which offers shorter length with a wide-mouth opening that retains surface area. This design reduces port noise and distortion, allowing JBL to design more compact enclosures for their hard-hitting subs. The 3/4" medium-density fiberboard construction offers strength and durability under extreme conditions, while the carpet covering and stylish aluminum grille help protect your investment.

Powerful bass from a GT5 12" sub
The JBL GT5 12" subwoofer brings the thunder with a polypropylene cone, hi-roll rubber surround, and I-beam basket design. It handles up to 275 watts RMS, so you can build a system that won't wimp out when it's time to rock. Hook the GT5-1202BR enclosure to an appropriate amp and some wiring, and get into some big league bass.

Product Highlights:

  • ported enclosure with one GT5 12" polypropylene woofer
  • 3/4" medium-density fiberboard construction covered with carpet
  • Slipstream slot port
  • 2-ohm total impedance
  • recommended power: 100-275 watts RMS (1,100 watts peak power)
  • frequency response: 45-150 Hz
  • sensitivity: 93 dB
  • 22-5/8"W x 14-9/16"H x 14"D1 x 10-15/16"D2
  • warranty: 1 year
  • Our 60-day money-back guarantee

Enclosed Subwoofers 101

An enclosed subwoofer is a box with a subwoofer already installed. The advantage to buying an enclosed sub is that the manufacturer made the sub, then designed and built the box as a perfect match, so you'll get the best possible performance. Every enclosed sub has a maximum RMS power handling rating, so pair it with an amp with a similar RMS power rating to get the best performance.

JBL GT5-1202BR Reviews

Average Customer Review:

2 Reviews

jbl gt5

Written by: kings from Hawaii on January 7, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

awesome speaker Inever knew jbl made car subwoofers

Pros: nice design heavy duty grill really clear low end

Cons: didnt like the wire clips on the box


Written by: Shawn Clevenger from Raymond, WA on July 1, 2014

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

Great product

Pros: Easy install

Cons: None

Hands-on research

What's in the box?

Download owner's manual

  • Ported hatchback-style enclosure with loaded 12" woofer
  • Owner's Manual
  • Warranty sheet

Product Research


Overview: The JBL GT5-1202BR is a single 12" preloaded enclosure with a Slipstream Port. The GT5-1202BR loaded enclosure features 3/4" medium-density-fiberboard (MDF) construction, high-quality binding-post terminals and a single 12" GT5 woofer. The GT5-1202BR features a wide-bandwidth design, which provides more output between 20Hz and 40Hz.

12" Subwoofer: The JBL GT5-1202BR features a single loaded GT5 12-inch, 2-ohm woofer. The JBL Grand Touring Series woofer features a polypropylene woofer cone with a heavy-duty molded dustcap. The woofer also features a rubber surround to provide exceptional cone-edge suspension and long-throw linearity with control and stability at the excursion limits. The GT5 woofer features a progressive spider, which offers better control at the excursion limits. This progressive spider reduces distortion at high output levels. The GT5 woofer also feature a vented pole-piece which provides additional cooling to the woofer's motor structure, resulting in an increase in the subwoofer's thermal power-handling capability. The vented pole-piece and motor structure provide additional cooling. In combination with the rubber-coated tinsel leads, this results in much better long-term reliability. In addition, the GT woofer utilizes dual-stacked oversized magnets which allows increased magnetic flux, resulting in higher efficiency and better woofer control. The JBL GT woofer features a die-cast aluminum basket for added rigidity.

Hatchback Enclosure: The JBL GT5-1202BR's enclosure is made from 3/4" medium-density fiberboard (MDF) and is covered with black carpet. It has been perfectly tuned for the in-car environment so it is optimized for tight, powerful, and precise bass response. The GT5-1202BR is rated at 2-ohms at the enclosure's speaker terminals. The GT5-1202BR's is a hatchback style enclosure designed to fit in the trunk or cargo area of many hatchbacks, coupes, sedans, SUVs and vans.

Slipstream Port: The JBL GT5-1202BR provides superior performance thanks to its revolutionary Slipstream port located on the front of the enclosure. The double-flared shape of the oversized port is precisely calculated, efficiently eliminating port noise. Even at high SPL, airflow through the port will remain uniform, offering better low-frequency extension and woofer protection. This gradual change from high pressure to low pressure eliminates the audible distortion called "whacking." Because the area of the port in the middle is much smaller than the mouth of the port, the port can be much shorter than a cylindrical port with a surface area the same as the Slipstream port's mouth; this means it can fit into regular boxes. Stickiness outside the box is maximized by increasing pressure, and stickiness inside the port is minimized by reducing velocity. The benefit of this proprietary technology is more bass output with greatly reduced port noise and distortion.

Binding Post: The JBL GT5-1202BR features a pair of gold-plated binding posts which will accept dual-banana plugs on the right-hand side of the box (when facing front of box). The GT5-1202BR is rated at 2-ohms at the enclosure's speaker terminals.

Metal-Bar Grille: The JBL GT5-1202BR features an Aluminum die-cast, metal-bar grille (two metal bars) which looks great and offers a high level of woofer-cone protection.

Our Product Research Team

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Customer Q&A

1 question already asked

Most 2 channel amps are not 2 ohm stable in bridged mode. You should get a mono amp that should output around 250-325 watts RMS at 2 ohms. Feel free to call an advisor on 1-800-324-9695 for a recommendation on an amp. [ Paul  Nov 25, 2015 ]  Staff