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Grand Touring Series 8" 4-ohm subwoofer

40 Reviews | 5 questions - 12 answers

Item # 109GTO804

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Our take on the JBL GTO804

Got an urge to get the lows bumping? JBL GTO subwoofers may just fit the bill. They work great in sealed or ported boxes, so you'll get bass the way you like it. And these compact subs offer a lower profile than most subs so they fit into smaller boxes that save you space.

Got an urge to get the lows bumping? JBL GTO subwoofers may just fit the bill. They work great in sealed or ported boxes, so you'll get bass the way you like it. And these compact subs offer a lower profile than most subs so they fit into smaller boxes that save you space.

The GTO804 8" subwoofer sports a polypropylene cone, with a big rubber surround that allows plenty of cone movement without sacrificing control. A heavy-duty dustcap reinforces the cone for lows that kick without distortion. A special integrated vent keeps the sub's internal workings cool and improves power handling capability.

To drive this single subwoofer, we recommend a mono amplifier rated between 150 and 300 watts RMS at 4 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Priced per speaker

Best small sub money can buy!!! Fit My 02 Tahoe like it was built for it.

RJM, Salem,IL

What's in the Box:

  • 8" Subwoofer
  • Self-adhesive foam gasket
  • Owner's Manual
  • Technical Data sheet
  • Warranty card
  • JBL decal

Product Highlights:

  • 8" 4-ohm subwoofer
  • polypropylene cone with Hi-roll rubber surround
  • power range: 50-200 RMS watts (800 watts peak power)
  • frequency response: 30-400 Hz
  • sensitivity: 91 dB
  • mounting depth: 4-3/8"
  • sealed box volume: 0.30 cu. ft.
  • ported box volume: 0.60 cu. ft.
  • Recommended Q-Logic Box Type: 1
  • warranty: 1 year
  • Our 60-day money-back guarantee

JBL GTO804 Reviews

Average Customer Review(s):

(40 Reviews)
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Hands-on research

Product Research


Woofer Cones: The JBL Grand Touring Series woofers feature polypropylene woofer cones with a heavy-duty molded dustcap.

Hi-roll Rubber Surrounds: The woofers feature hi-roll rubber surrounds to provide exceptional cone-edge suspension and long-throw linearity with control and stability at the excursion limits.

Spider: The woofer's progressive spider provides better control at the excursion limits and reduces woofer distortion.

Shallower Design: The Grand Touring Series' new proprietary frame, unique in-board motor structure, and new cone design allow the woofer to be a full inch shallower than equivalent-sized models.

Terminals: The woofer features binding post terminals which can accept bare wire, pin connectors, spade lugs, and single banana plugs. Because of the spacing between the + and - terminals, it cannot accept dual banana plugs.

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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

5 questions already asked

I forwarded your question to an Advisor and they responded with the following: Unfortunately, the JBL GTO804 is not recommended for free-air applications. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  Nov 12, 2014 ]  Staff
Using these subwoofers in your front door wold not be practical. You would need a custom enclosure for these to fit into (normally fabbed from fiberglass) and then they would stick out most likely preventing the door from closing. You have other options like installing the sub into a custom enclosure for the kick panel (depending on what kind of car/truck you have), under your seat, or use one sub in an enclosure in the middle arm rest. Another option is to run two 6.5s in your door this way you can get the volume you want with lower power. Personally that's the way I would go. [ KIRK  Jul 08, 2014 ]
hi,yes i installed this sub on a 7 speaker system in my 379 peterbilt it has 1,8" and 2, 6.5 subs they work great ..hope this helped you,,,,, [ RAYMOND  Jul 08, 2014 ]
Thanks for your question. For information on comparing two or more models I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences and help you make the best choice for your system and your budget. [ Greg  Jul 08, 2014 ]  Staff
This sub will work with stock configuration. It doesn't use the original harness that plugged into the stock sub, you will have to cut and splice the two wires to connect them to this speaker, not a big deal. I too am using the stock amp to power this speaker and it works well, although I believe this speaker is capable of more with an aftermarket sub. Regardless, it sounds really good with the stock amp so far. As far as fit, it is not a direct replacement. The original sub has a plastic ring that clamps the speaker down to the rear decklid. That ring will no longer fit, and I had to drill a few new holes and used some self taping screws to tighten it down. It will all fit under the original third brake light housing and look factory original. It will take a little work, but no big deal. [ GREG  Jul 01, 2014 ]
Yes it will work. However, I do recommend to upgrade your stock AMP to power stock AMP will get the job done however you will be very satisfied with the upgrade results. [ DERRICK  Jul 01, 2014 ]
Mohammad, It fits in there fine, but none of the mounting holes line up. Instead of drilling into the heavy steel upside down in my trunk, I opted to silicone it in there. When you remove the old speaker, cut the wire as close to the solder as possible. There is no extra length to the wire and it is farther away from the posts of the new speaker, so it's a bit of a pain to line up. I still have the factory setup and amp and this was to replace the stock one that was blown. I am content with the sound, but it really does not punch very much. I'm sure a new head unit would bring much better performance. I'm going to add that soon. Good luck [ JEREMY  Jul 01, 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. [ Greg  Jul 01, 2014 ]  Staff
Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system. [ Krissy  Apr 06, 2014 ]  Staff
hi just wanted to thank you for answering my question. Also the JBL that the enclosure was for, sounds incredible even with a crapy amp. can't wait to get an amp that can drive it. thanks [ Dennis  Mar 11, 2014 ]
To figure cubic inches, you simply multiply width x height x depth. One cubic inch is 1"high x 1"wide x 1"deep (1" x 1" x 1"). Here's an example: if a driver requires a volume of, say 518 cubic inches, your width x height x depth should equal 518. If you want a width of, say, 12" and a depth of, say, 20", you multiply width x depth (12x20=240). Since our goal is to equal a volume of 518, you then divide 518 by 240, and this will give you the height (518 / 240 = 2.15) As a result, one example of a 518 cubic inch volume would be 12" x 20" x 1.15". Remember that these are your INTERNAL dimensions, so for a speaker cabinet, you must add the cabinet material thickness to get external dimensions. [ Matt  Mar 07, 2014 ]
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center: [ Jeff  Dec 22, 2013 ]  Staff