I bought this subwoofer to run it by itself almost a year ago now. I have it running at 350rms 800peak in a ported box in the back of my hatchback.. It's still running great. This sub hits fantastic. Absolutely shakes the car. It's like having a back massager in my chair. If you're on a budget, this is the best boom for your buck.
300W 15" GT Series Single 4 ohm Subwoofer
For anyone who likes to crank it up in the car, the JBL® high-output GT5-15 subwoofer is the real deal. The JBL GT5-15 subwoofer features a single 4-ohm voice coil and a vented motor structure, and offers 1200 watts of peak power handling. The GT5-15 also features JBL’s newest design, combining classic elements with modern ones.
The GT5-15 follows the design of the more-expensive JBL subwoofers, combining classic elements with modern ones.
Significant Power Handling Capabilities
The GT5-15 handles as much as 300W/1200W (RMS/Peak) • With its fully vented motor structure and rubber-coated tinsel leads, the GT5-15 is able to withstand even the most intense bass assault.
Dual-Stacked, Oversized Magnets
Unlike competing entry-level subwoofers, the GT5-15 is based on a solid motor structure featuring two large magnets covered by the classic JBL rubber ring.
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.
- 15" Single 4 Ohm GT Series Subwoofer
- Power Handling:
- Peak: 1200 watts
- RMS: 300 watts
- Recommended power range: 150 - 300 watts RMS
- Impedance: Single 4 Ohm
- Polypropylene cone woofer
- Rubber surround
- Completely vented motor structure
- Rubber-coated tinsel leads
- Single 4 Ohm voice coil
- Dual-stacked oversized magnets
- Frequency response: 25-400 Hz
- Sensitivity: 92 dB
- Authorized Internet Dealer
- 1-year Manufacturer's Warranty
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".
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.
Recommended Enclosure Specifications
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.
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.
What is in the box?
Warranty and Return Policy
Summary of Customer Ratings & Reviews
riviera beach, FL
May 13, 2009
I bought two of these from Sonic and put them in my Integra. They're in a cheap-o box made of 1/2 MDF and running off the Power Acoustik BAMF-2000/1D amp. OH MY GOD! These are OFF THE HOOK! I got the loudest sound system at my school. Awesome sound quality too! If you're on a budget and you're looking for some SLAP, get these with the amp I mentioned. YOU WON'T BE DISAPPOINTED!
18 of 21 found this helpful
Newport News, VA
Trinidad and Tobago
May 5, 2011
This subwoofer is amazing. I own one of these and can't complain, I've had it for over a year now and it still handles the daily abuse I give it. It can hit so hard that I've broke the seals on my box twice. Place it in the recommended 1.5 cubic foot sealed enclosure and you will have no need to complain. I install my own and "wow" my friends song after song with this sub.
15 of 18 found this helpful
August 4, 2012
I was just taking a trip down memory lane, looking up the specs of my beloved subs and had to leave my two cents. I have had two of these puppies bumping 1800 watts through my car for four years now and have loved it. I have them in a double slotted enclosure and they never fail to impress and inspire. These subwoofers have shaped my life! Friends bring their ipods with them when we take trips in my car and everyone knows that in my car you roll down the windows, turn up the bass, and enjoy the ride. These subs are durable, beautiful, deep, and give a thick bass sound. I hope you find yourself inspired to drop a note of praise four years down the road as well.
14 of 17 found this helpful
April 4, 2011
I bought one of these subs and was going to get something cheap until I saved up until I was going to buy expense. I am no longer going to buy something to get more. The bass is great and hurts my ears now, so I don't need anything else. I know a lot of post would want to thousands of watts etc, but man this is just to great for the money. And shipping was so fast for free. Now I need to buy some stock smaller speakers.
My truck is a 99 Ford Ranger
15 of 19 found this helpful
January 21, 2016
Put two of these in a vented box with a boss 4000 watt armor mono aamp wired for 2 ohms. Realisticly its only 600 to 700 watts RMS. Sounds great hits the low notes hard. I have around $320 in the whole set up. Definitely recommended.
0 of 0 found this helpful
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1 JBL GT5-15 Subwoofer
2 Channel Amp - Bridged
2 JBL GT5-15 Subwoofers
2 Channel Amp
4 Channel Amp - Bridged
3 JBL GT5-15 Subwoofers
4 Channel Amp
4 JBL GT5-15 Subwoofers
Mono Amp - Option 1
2 Channel Amp
2 Channel Amp - Bridged
4 Channel Amp
Internal Product ID
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.