The MB Quart MBQJ-STG4A-1 is an 800 watt Jeep Wrangler speaker upgrade for 2018-current Wrangler JL and 2020-current Gladiator JT that keeps the factory radio: two 3.5 inch dash coaxials, two 6.5 inch midbass drivers in composite front enclosures, and two 400 watt Class D amplifiers. It is the front half of an MB Quart Stage system and needs a rear speaker kit or soundbar.
The AAMPRO plug and play interface lets the system run from the OEM source unit, so you keep the factory screen and controls. Both versions share the same speakers, enclosures and amplifiers. If you plan to replace the factory radio, choose the MBQJ-STG4AH-1.
This is the Jeep Wrangler speaker upgrade at the heart of MB Quart's Jeep audio line: the Jeep Wrangler speakers and Jeep Gladiator speakers up front, plus the amplification to drive them. It replaces the factory Jeep JL speakers up front, serves as a Jeep JL speaker upgrade or a Jeep Gladiator speaker upgrade, and its 3.5 inch units replace the Jeep Wrangler dash speakers. With two 400 watt amps it works as a Jeep Wrangler amplifier built into the kit, and it is the base for a full Jeep Wrangler sound system once you add rear Jeep speakers and a subwoofer.
Key Features
- Two 3.5 inch coaxial dash speakers with 0.75 inch dome tweeters
- Two 6.5 inch midbass drivers with lightweight pop paper cones in a mica blend
- Composite front speaker enclosures that drop in as a direct replacement for the factory enclosures, with an integrated OEM module mounting location
- Two 400 watt full range, two channel Class D amplifiers (compact NA2 amplifiers with on-board equalization) on a powder coated mounting plate
- AAMPRO plug and play interface so the system runs from the factory source unit
- Vehicle-specific wiring for a plug and play, OEM style installation
Built To Solve: Weak Factory Front Speakers in the Jeep Wrangler JL and Gladiator JT (Factory Radio)
- Front speakers that run out of clean volume with the top and doors off
- Factory amplification that cannot drive upgraded speakers
- Wanting more output without losing the factory radio and screen
- Avoiding custom front speaker mounts and spliced wiring
Best For: Wrangler JL and Gladiator JT Owners Keeping the Factory Radio
- Owners who want a Jeep Wrangler audio upgrade without replacing the factory source unit
- Owners planning a staged build: add a rear speaker kit or soundbar, then a subwoofer
- Not the right version if you are replacing the radio; see the MBQJ-STG4AH-1
Specifications
- Front speakers: two 3.5 inch coaxial with 0.75 inch dome tweeters (MB Quart's page lists the dash tweeter as titanium in the feature list and magnesium in the kit list) and two 6.5 inch midbass drivers, pop paper cones with mica blend
- Front speaker specs: crossover 12dB midrange / 6dB tweeter, frequency response 75Hz to 23kHz, sensitivity 89dB, 300W max / 150W RMS
- Enclosures: composite, integrated OEM module mounting location, drop-in replacement for factory enclosures
- Amplifiers: two 400 watt full range, two channel Class D (compact NA2 with on-board equalization); powder coated mounting plate
- Total system power: 800 watts
- Source unit: uses OEM source unit via AAMPRO plug and play interface
- Rear speakers: not included; requires a rear speaker kit or soundbar
- Listed weight: 26.0 lbs; listed dimensions: 22.24 x 18.34 x 10.59 in
- Install: basic hand tools
- Color: Black; warranty: 1 year
- MOPAR Part Number: 68729812AA
- Manufacturer Part Number: MBQJ-STG4A-1
Fitment
MB Quart lists this product for:
- Jeep® Wrangler (JL) 2018-Current with OEM radio
- Jeep® Gladiator (JT) 2020-Current with OEM radio
MB Quart publishes a 2024 Wrangler JL / Gladiator JT amp plate technical service bulletin for this system; follow it on 2024-current models.
MB Quart also publishes a separate 2024 Wrangler JL / Gladiator JT install guide for the MBQJ-STG4A-1.
This is a Jeep (on-road vehicle) audio product, not a UTV part. Confirm your model, model year and factory audio equipment against MB Quart's listing before ordering; fitment is not guaranteed on applications not listed.
FAQ
Does the MBQJ-STG4A-1 work with the factory radio?
Yes. MB Quart says it uses the OEM source unit through an AAMPRO plug and play interface.
Are rear speakers included?
No. MB Quart lists the Stage 4 system as requiring a rear speaker kit or soundbar, such as the JC1-169SB or JC2-169 6x9 kits or an MBQJ-48 series soundbar.
Which Jeeps does it fit?
MB Quart lists Jeep Wrangler (JL) 2018-Current and Jeep Gladiator (JT) 2020-Current with the OEM radio.
What is in the box?
Two 3.5 inch coaxial dash speakers, two 6.5 inch midbass drivers, composite front speaker enclosures, two 400 watt two channel Class D amplifiers with a powder coated mounting plate, and vehicle-specific wiring with the AAMPRO interface.
How hard is the install?
MB Quart describes a plug and play, OEM style installation with basic hand tools. MB Quart publishes an assembly guide and, for 2024-current models, an amp plate technical service bulletin.
How does Stage 4 compare with MB Quart's Stage 7 to Stage 10 packages?
Stage 4 is the front system on its own. MB Quart's Stage 7 and Stage 9 Wrangler packages and Stage 8 and Stage 10 Gladiator packages bundle this factory-radio system with a subwoofer and rear speakers or an RGB soundbar for 1200 watts total.
Why MB Quart
MB Quart builds vehicle-tuned audio packages for the Jeep Wrangler JL and Gladiator JT, engineered around the factory mounting locations and wiring so the upgrade installs with basic hand tools instead of custom fabrication. MB Quart sells its Jeep kits in stages, so you can start with one piece and add matching speakers, subwoofers or a soundbar later.
Build Your Jeep Wrangler JL Stage 4 Audio System
Confirm your model year and that you are keeping the factory radio. Then choose the rear speakers: JC1-169SB (2018-2023) or JC2-169 (2024+) 6x9 kits, or an MB Quart rear soundbar. Add a subwoofer such as the MBQJL-302 tailgate sub (Wrangler) or MBQJT-SUBA-1 underseat subs (Gladiator) when you are ready. Questions? Contact Dunes 2 Dezert SXS before you buy.
