MB Quart

MB Quart MBQJ-STG4AH-1 800W Stage 4 Jeep JL JT Car Audio Upgrade Kit with Amplifier 4-Speaker Set Tweeters

3.9(23)

133+ bought in the past month

$1049.99

About this item

  • Vehicle-Specific Fit: STAGE 4 Jeep Wrangler JL/Gladiator JT kit with plug-and-play OEM harnesses; designed for aftermarket radios and requires rear speaker kit for full coverage
  • Four Speaker Set: Includes (2) 3.5-inch coaxial speakers with 0.75-inch magnesium dome tweeters and (2) 6.5-inch midbass drivers with polypropylene/mica blend cones
  • High-Power Amplifiers: Dual 400-watt NA2 Class-D compact amplifiers with on-board equalization deliver 800 watts peak output, high efficiency, and balanced full range sound
  • Optimized Audio Performance: Crossover network (12dB midrange / 6dB tweeter) ensures clear highs, detailed midrange, and strong bass response for an upgraded Jeep sound system
  • Durable & Precise Build: Rugged construction with metal and plastic enclosures; frequency response 75 Hz–23 kHz, sensitivity 89 dB; dimensions 22.24 x 18.34 x 10.59 inches
$1049.99

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Product details

BrandMB Quart
Audio Output ModeStereo
Mounting TypeFlush Mount
MaterialMetal, Plastic
Speaker TypeVehicle Specific

Technical specifications

recommended_uses_for_productFor Vehicle Audio Systems (Jeep® Wrangler (JL) / Gladiator (JT))
surround_sound_channel_configuration2.0
included_componentsWiring and Harness
warranty_typeFull
power_sourceCorded Electric
audio_driver_typeDynamic Driver
specific_uses_for_productIn-car audio system for Jeep® Wrangler (JL) and Jeep® Gladiator (JT) vehicles
upc806576236580
style800W Stage 4 Audio System (Requires Aftermarket Source Unit)
global_trade_identification_number00806576236580
manufacturerMB Quart
item_model_numberMBQJ-STG4AH-1
best_sellers_rank#591 in Powersports Speaker Systems
date_first_availableSeptember 12, 2025
departmentAdults

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Customer reviews

3.923 ratings

Customers say

Customers find the subwoofer system easy to install and appreciate its perfect fit and value for money.

★★★★★

Honest Review - Huge improvement over factory!

Reverend DSeptember 12, 2025

Great value for the money! Installed in a 2022 JL that is not amplified. Huge improvement over the mini speakers that came factory. Removing the plastic part that holds the overhead light was the least enjoyable part. Just follow the template and you will be fine. Super simple with a dremel. I did use some cheap poly-fil and now I actually have some bass. The speakers are not bright and since they are next to your head go for the matching mb quart for the upper dash to round out the sound. However an Amp would really bring them to life. Read more

Review image 1
★★★★★

Factory look, excellent sound quality

BGSeptember 8, 2022

Replaced stock head unit (5") with Insane Audio head unit, swapped out the stock 3.5" dash speakers and changed sound bar speakers to 6.5" (Infinity Reference). Added a Alpine PWE 8" compact sub behind the seat. The Alpine sub filled the mid bass in nicely, but I just wasn't happy with the lows. Decided to take a chance on the MB Quart sub and ditch the Alpine. The custom box fits perfectly and looks like factory. You have to remove the under seat storage tray and the sub uses the trays mounting points (doesn't interfere with jack or bolt holder box). The box is a heavy plastic and has some sound dampening material in it. The amp is very compact and I mounted it right behind the box. It also comes with a remote volume knob. Sound quality is very good. Granted, I am not a young kid who listens to obnoxious amounts of bass and wants to rattle my truck apart and annoy everyone. But, this thing is 10x better than the compact subs and the (2) 8" provide a really nice amount of accurate base. I've heard the Alpine factory sub, and this is worlds better. I am using dedicated sub RCA pre-outs from the head unit, so not sure how the high level inputs would work. For $599, this is a really good deal (less than half of JL unit). High Points: Sound quality, factory look, ease of install Low Points: Amp is just OK, you lose what little storage there is, volume knob doesn't have any mounting included. Read more

★☆☆☆☆

This is not plug and play and is incomplete….

Auto Sales UnlimitedMarch 7, 2025

This product is no as advertised, if you are looking for a plug and play for your Jeep this will Not be a good option for you. This is missing pretty much EVERYTHING needed to work for your Jeep truck. Be sure if you want to use this item that you make sure you are ready to buy about $400 plus dollars more to make this work for your Jeep, it’s missing ALL wiring needed to hook to your factory system and is a separate product line you will need to purchase, further once installed it will need to be flashed by Chrysler to make the system even compatible with your Jeep gladiator. The purpose of buying this was it said it was simply plug and play but that’s is not at all what this is. This is a mer component or piece but certainly is not even close to a system that will work in a Jeep product line. Please be aware when buying: you will need multiple wiring kits to make it to your factory stereo, you will need interface, you will need it programmed from Chrysler and you will need amp wiring kit for this product line. So be prepared to spend about $1500 to make this speaker kit even work for your gladiator. Read more

★★☆☆☆

Overpower their "tuned" fronts; wouldn't recommend without a full amp/dsp upgrade

RobSoLFJanuary 4, 2024

Edit: I'd continued to be underwhelmed by these speakers, particularly in the area of decent bass, when I'd discovered Mike's review, here. In short, neither plug from the bar gives you full signal: You either can use the MBQ connection which cuts lows substantially, or you use the other plug which only passes lows, and extremely limited output lows, at that. Because, you know, that signal originally went to a 4"... "woofer". LOL So while I'm somehow even less impressed with Jeep's audio system now, MB Quart is now off my list of manufacturers to purchase from. These and the fronts they offer are marketed as versions "tuned" to the JL Wrangler, but in fact they are actually just units they already manufactured that fit in those spaces(and you have to cut to put the 6x9's in. "Upgrading" to 6x9's in the bar is pointless when the bass is cut out of the signal; you'd be better off just finding good 3.5's and 4.0's to use the stock holes. In short, they are full of crap. Original Review: I bought all 3 pairs that are "tuned for this vehicle". They do sound better, but the soundbar speakers over power the 2 pairs of fronts; you have to pull the fader 2+ clicks toward the front to balance them out. Without new amps/dsp, this doesn't seem to be a great investment for the improvement you get. And if you do plan to go full upgrade, Jeep tries to poke you in the eye there, too, killing speaker output that doesn't match the speaker resistance it expects. Read more

★★★★★

Easy installation. Perfect fit.

Anthony CrispinoJanuary 25, 2023

Not only after test fitting was it perfectly fit, I went ahead and purchased the complete Stage 6 setup. MB Quart is excellent gear for a very good price. Fast shipping and hassle free. Read more

★★★★★

Good value

John VanAsscheOctober 14, 2023

Great fit. Great sound. Read more

★★★☆☆

It’s over priced

WilliamJuly 2, 2023

I purchased the box with amp and honestly it’s sound like 2 cheap 8” subs. The amp sucks it’s way under powered especially set to 0db. I switched mine to 12db and line all pods at at 3 o’clock. I plan to order 2 new Sundown 8” subs with 1k amp. I recommend Rockford Fosgate Punch P300-10 Single 10" 500-Watt Amplified Truck Sealed Box Subwoofer it fits and sounds way better for half the price. Read more

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★★☆☆☆

Horrible lying crap

mikeJuly 19, 2023

What they don't tell you until you look it up online is that they have wired this system to plug and play with the stock systems TWEETER. They originally had it wired to the stock full range speaker but because of the stock systems use of resistors and diodes to send only certain signals to certain speakers,by tapping into the larger of the two stock speakers in the sound bar the new mb quarts speakers were getting too much bass and not enough highs so they changed it so that they now only get highs. They sound like complete crap, you didn't do anything wrong... It's the way they decided to solve a problem. Take the time to cut the plugs and wire to the larger speaker and it will sound 100% better!!! Read more

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