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JBL GT-BassPro12

Ported powered subwoofer with 12" sub and 150-watt amp

72 Reviews | 17 questions - 45 answers


Our take on the JBL GT-BassPro12

JBL's GT-BassPro12 powered subwoofer adds a blast of bass to your vehicle so you can really feel your music's impact as you drive. JBL designed this bass system to shine in the car environment, tuning it for tight, responsive low notes.

JBL's GT-BassPro12 powered subwoofer adds a blast of bass to your vehicle so you can really feel your music's impact as you drive. JBL designed this bass system to shine in the car environment, tuning it for tight, responsive low notes.

Powerful bass from a 12" sub
The GT-BassPro12 enclosure features a JBL 12" sub that really brings the thunder with its polypropylene cone and hi-roll rubber surround. The built-in 150-watt amplifier is matched up perfectly to the sub, so it won't wimp out when it's time to rock. Use an amp wiring kit to power up the GT-BassPro12, and you've turned your car into a concert hall.

Unique port for compact design
The enclosure features JBL's unique Slipstream port, which offers shorter length with a wide-mouth opening that reduces port noise and distortion. This means that JBL can build a more compact enclosure, and still get great performance from this hard-hitting sub. The medium-density fiberboard construction offers strength and durability under extreme conditions, while the carpet covering and stylish metal grille help protect your investment.

Very nice subwoofer. Bass sounds amazing and definitely trumps a lot of other ported subs on the market. Would definitely recommend if you have a smaller car.

Cameron, Colorado Springs, CO

What's in the Box:

  • Amplified enclosure loaded with one 12" JBL subwoofer
  • Two 25 amp fuses (1 installed/1 extra)
  • 12" Speaker input harness
  • Wired remote level control
  • 16.5' Remote level control cable (RJ-25 plug on both ends)
  • Two 3/8" Self-tapping screws
  • Owner's manual (English/ German/ Spanish/ French/10 Other languages)

Product Highlights:

  • powered 12" subwoofer enclosure
  • built-in 150 watt RMS amplifier (450 watts peak)
  • remote bass-level control included
  • variable low-pass crossover (40-200 Hz, 12 dB/octave)
  • frequency response: 35-120 Hz
  • fuse rating: 25A
  • 22-1/2"W x 14-5/8"H x 12"D1 x 9-1/8"D2
  • warranty: 1 year
  • Our 60-day money-back guarantee

JBL GT-BassPro12 Reviews

Average Customer Review(s):

(72 Reviews)
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Hands-on research

Features and Specs

Enclosure Type Ported
Finish Material Carpet
Grille Steel
Connector Type RCA/Harness
Bi-amp Inputs No
Woofer Size (inches) 12
Woofer Material Polypropylene
Passive Radiator ---
Width 22-1/2"
Height 14-5/8"
Depth 12"
Second Depth 9-1/8"
Parts Warranty 1 Year
Labor Warranty 1 Year
Frequency Response 35-120
Amplifier Power (RMS) 150 watts
Maximum Wattage 450 watts
Sensitivity N/A
Impedance N/A
Second Voice Coil Impedance ---
Crossover Point 40-200

Product Research


Amplifier: The power output from the built-in amplifier is 150 watts RMS (450 watts max). The amplifier is counter sunk into the back panel of the enclosure (the heat sink fins protrude approximately 3/8").

Note: Neither speaker wire, RCA interconnects, nor amplifier wiring kit (power/ground/turn-on wires) are included.

Signal Input: The amplifier has both speaker level (harness) and line level (RCA) inputs. The input sensitivity range is 50mV-4V for the line inputs and 400mV-16V for the speaker inputs.

Crossover: The amplifier's low pass crossover point is continuously variable from 40 to 200 Hz; the crossover slope is 12 dB/octave.

Bass Boost: The bass boost circuit provides a variable (0-12 dB) signal boost centered at 45 Hz.

Status LEDs: There are two status indicator LEDs on the amplifier. A green LED lights to indicate the amplifier is turned on and operating normally. A red LED lights to indicate the amplifier's protection circuitry has been activated. The protection circuit activates and the amplifier shuts down when the input voltage (power) is too high or too low, when the amp overheats, and when there is a short between the amp and subwoofer.


  • Width: 22-1/2"
  • Height: 14-5/8"
  • Depth (bottom): 12" (the grille adds approximately 2-1/8", for a total of 14-1/8")
  • Depth (top): 9-1/8"

Remote Level Control: The included remote level control lets you adjust the output level of the amplifier from the front of the vehicle. It can be mounted under the dash, in the glove compartment, etc, and has the following dimensions:

  • Width: 1.625" (2.55" including the mounting flanges)
  • Height: 0.775"
  • Depth: 1.525" (2.028" including the knob and cable)


  • Auto Turn-On: two position switch; on/off; when using the speaker level inputs the amplifier will turn on automatically when it senses an input signal
  • Phase: two position switch; 0° or 180°; the sub's phase can be easily inverted
  • Crossover Frequency: rotary knob; set the low pass crossover point; continuously variable from 40 Hz to 200 Hz
  • Bass Boost: rotary knob; continuously variable from 0 to +12 dB
  • Level: rotary knob; continuously variable from 50mV-4V (line level) or 400mV-16V (speaker level)


  • Remote Bass: RJ-25 jack for use with the included remote bass level control
  • Fuse: a single 25 amp ATO style fuse protects the amplifier
  • Line Input: stereo RCA jacks (female)
  • Speaker Input: 4-pin plug for use with the included harness
  • Power Input: screw terminals for power, ground, and remote turn-on; each will accept spade terminals up to 0.325" wide (approximate)

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Simple I wanted bass in a small enough package that hits big enough for my 84 Pontiac Parisenne. Honestly, if your looking to add lows to any ride this does the trick for any ride. I heard them in SUVs, hatchbacks, small sedans, and big old ones like myself. Great buy. I am buying this one again soon. [ John  May 08, 2017 ]
Shopped around locally and could find nothing comparable. [ Thad  Dec 15, 2016 ]
this thing rocks small so don't take up a lot of room and very adjustable freq bass gain with remote bass adjustment. [ eric  Sep 03, 2016 ]
Very great bass. In trunk of grand marquis works very well. Install was easy. Like remote control I put it under dash to dial in bass needed. Not overwhelming. [ john  Jan 18, 2016 ]
It had a five star rating and was priced in my range [ Cristine  Jan 10, 2016 ]
Simple setup with strictly the wires. Nice power and sound for the money with amp and enclosure included. JBL makes some of the best subs and speakers. [ IAN C  Dec 28, 2015 ]

17 questions already asked

It's basically like installing an amp- all speaker connections are already connected. You would need to run a power line from the battery, A ground line to the closest place you can screw it down to, and a remote line to either your aftermarket radio or ignition. Plus either RCA cable from your aftermarket radio or Run the input from your back speakers using the built in inline converter. you can always call crutchfield support to help you too! [ Joe  Oct 29, 2016 ]
very easy install. sounds great! [ ARON  Oct 29, 2016 ]
Not really sure how big the camaro trunk is, right now it's in a infinity g35 trunk and fits right in. Takes up a fair amount of space but hits pretty good. [ DANIEL  Dec 16, 2015 ]
I am not sure about the size of a Camaro trunk but if it will fit you most certainly will love the sound. [ BYRON C  Dec 16, 2015 ]
We have it mounted in the trunk of a 200 model BMW 323i With room to spare but not sure how much space the Camero has [ MARTIN S  Dec 15, 2015 ]
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Kenny  Dec 15, 2015 ]  Staff
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy  Dec 06, 2015 ]  Staff
I didn't have to buy anything extra my wires for the amp were in the box [ Gary  Feb 18, 2016 ]
No. You need to add an amplifier install kit. You need to run power to the amp. [ DANIEL  Oct 08, 2015 ]
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy  Sep 11, 2015 ]  Staff
To be honest you could, But you would need double the wires like, Power Ground Audio and Remote wires. You might blow a fuse or something worse. Better off with one amp and a dual sub box. I will say this you don't need two of them if you just want more bass out of your system. This package sounds fantastic! I can't believe how good it sounds and its pretty deep too. [ John  Sep 08, 2015 ]
I guess you could if you run big enough wire from the battery. These don't pull that much power. The question is, do you have enough space for two of these? [ George  Sep 08, 2015 ]
I think you probably could. You would have to find a way to split the power cable from the battery, remote turn on wire, ground cable, and RCA input line from the head unit so that both subs picked up a signal. Nothing someone couldn't handle if they have extra speaker wire and some basic electrical/soldering skills. [ Spencer  Sep 08, 2015 ]
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy  Sep 02, 2015 ]  Staff
Rob takes 5 minutes to disconnect [ JAMES  Sep 01, 2015 ]
It does have fairly easy disconnects for the power, ground, and audio but I don't know if it would be considered a quick process. It will take 5 minutes or so to reconnect. Also this is a decent size subwoofer to move around. [ BYRON C  Aug 26, 2015 ]
Autumn, removing your Sub couldn't be easier. All the wires in the back of the speaker are quick connects. They pull off, then push back on. It's obvious where they connect, but you might want to mark their places with tape and a marker. [ FRANK  Aug 26, 2015 ]
Yes, the sub can be removed fairly simply by disconnecting a few wires. I'd recommend plastic wire covers to prevent the power and ground connections from touching anything and blowing the fuse. [ Hakeem  Aug 26, 2015 ]
It doesn't have a "quick disconnect" so you would have to undo some wires. Other that that its fairly simple to remove. [ Mark  Aug 26, 2015 ]
It's pretty much self contained. The amp connections use a Phillips screw driver, I'd probably recommend putting some type of end on the wiring instead of just the bare wire like my set up, if it's coming In and out often the wire ends will get pretty frayed. But yes, takes about 60 seconds to undo the 3 wire connections and lift it out of car [ DANIEL  Aug 26, 2015 ]
I forwarded your question to an Advisor and they responded with the following: The JBL subwoofer should work great with the JVC receiver. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  Mar 02, 2015 ]  Staff
It has to be sitting upright due to the fact that the amp is built into the'll kink the wires laying on its could probably build a little platform to sit it up off the wires if you have the room. [ AARON  Jan 11, 2015 ]
Hi Robert, I think it can be used on its backside facing up. However the cords come out of the back so you have to find a way not to crimp or ruin the cords if you lie it on its back. I'm almost positive you can position sub woofers in any direction, but experiment because you will get different sounds. Also, if you have a smaller car, a smaller sub will actually give you bigger sound because of the way bass waves travel. [ Natasha  Dec 30, 2014 ]
It can't lay on its back with the sub facing straight up. On the back is the connections and heat sync for the amp sticks out some. [ BYRON C  Dec 22, 2014 ]
The amplifier is on the back of the box so it would be laying on the wires.. but I'm sure you could if that wouldn't bother you. . Sub sounds very nice for price point too.. installer was impressed .. [ CHRISTOPHER  Dec 21, 2014 ]
I am using it sitting upright. I never tried it laying on its backside. I had an audio place connect for me and that is how they installed it. I diva a Tahoe with no 3rd row seats. [ Edward S.  Dec 21, 2014 ]
I would not recommend placing this unit on it's backside due to all of the cables being located in the back and thus not allowing it to lay flat. [ Nicholas  Dec 21, 2014 ]
You could if you wanted but the amp and all your hook ups are on my way the back. [ ROBERT  Dec 21, 2014 ]
check amp rating for wire load requirements, I don't believe 4 will work may overheat, depends on AMP used, [ Ron  Dec 08, 2014 ]
With proper end on wire. [ BRIAN S  Dec 02, 2014 ]
Yes [ Timothy  Dec 08, 2014 ]
Yes [ RANDALL  Dec 03, 2014 ]
Yes [ Timothy  Dec 08, 2014 ]
Worked well in our setup. Was installed in a jetta and ran the wiring all the way to the trunk. Blew the amp fuse a couple times but never the link in the power wire from the battery. And amp fuse was most likely just a tune /volume fault of ours, at 18 years old "it's all about that bass " [ DANIEL  Dec 03, 2014 ]
Box up against back seat with speaker facing the rear bumper [ Joe  Oct 29, 2016 ]
I currently have mine facing toward the back of my 05 gli and I get a perfect balance [ ZACHARY S  Sep 09, 2014 ]
My son has this sub in his 2002 Honda Accord. He has it facing towards the back and has excellent sound, plus has room for his golf clubs. If he had it facing forward, the bass would be muffled. [ SHAWN  Sep 09, 2014 ]
Install the sub facing the back towards the trunk. That way you pretty much make your whole trunk a huge box. [ ROBERT  Sep 08, 2014 ]
I ran my wires to the back speakers instead of RCA cables, the only thing is that I think I bought one of their wiring packs. [ CARLOS  Aug 14, 2014 ]
You can, but you will need the cables that are open wire to rca adapters. Then adjust gain accordingly. [ DAVID  Aug 14, 2014 ]
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you. [ Jeff  Feb 25, 2014 ]  Staff
Hooking the amp up will a 4 gauge work [ JAMIL  Dec 01, 2014 ]
Will a 4 gauge work for wiring the sub [ Jamil.S  Dec 01, 2014 ]
it depends if you have preamp outputs. if you don't then you will have to buy the line to signal converter. the only other thing you need is the wiring kit. You will LOVE the sound of this sub, especially if it is in the open. chris [ CHRIS  Jan 13, 2014 ]
Just the wiring. Choose what size gauge wire you want or wire kit you prefer and that is it. You tap in to the left and right side of speakers, find a good ground and connect battery cable and you should be good to go. [ CARLOS  Jan 11, 2014 ]