The MB Quart MBQJT-SUB-ACC-1 is a 400 watt Jeep Gladiator under seat subwoofer package for the 2020-current Gladiator JT: it adds dual 8 inch underseat subwoofers with a 400 watt amplifier to the factory radio and speakers through MB Quart's MBQJ-AMP-ACC-1 line output converter kit. MB Quart describes it as plug-and-play installation using OEM harnesses.
MB Quart bundles 2 products in this package: MBQJ-AMP-ACC-1, MBQJT-SUBA-1. It is built for owners who want more output and bass without replacing the factory head unit or front speakers.
As a Jeep Gladiator under seat subwoofer package, it adds the MBQJT-SUBA-1 Jeep Gladiator subwoofer system, the same Gladiator subwoofer MB Quart uses in its Gladiator stage packages, without changing the radio. The Jeep Gladiator subwoofer box holds dual 8 inch subwoofers, making it a simple Jeep subwoofer add-on, a Jeep Gladiator audio upgrade and the bass half of a Jeep Gladiator sound system at 400 watt total system power.
Key Features
- 4-channel line output converter (LOC) with signal harnesses for 2018-2023 and 2024-current Wrangler JL / Gladiator JT
- Power harness that is plug-and-play with up to three MB Quart NA2/NA4 amplifiers, plus a powder coated mount for three amplifiers
- Two 8 inch long-throw subwoofers rated at 200W RMS in a rear underseat HDPE enclosure with a molded-in center support and 1.0 cubic feet of internal airspace
- 400 watt high efficiency Class D subwoofer amplifier
Built To Solve: Missing Bass and Rear Output on the Factory Radio in the Jeep Gladiator JT
- Factory audio that lacks bass
- No clean way to add amplifiers to the factory radio
- Cut-and-splice wiring for aftermarket amplifiers
- Wanting to keep the factory head unit and screen
Best For: 2020-current Gladiator JT Owners Keeping the Factory Radio and Speakers
- Owners who want to add dual 8 inch underseat subwoofers without replacing the factory radio
Specifications
- Package contents (per MB Quart): MBQJ-AMP-ACC-1 line output converter kit (4-channel LOC, signal and power harnesses, three-amp mount); MBQJT-SUBA-1 dual 8 inch underseat subwoofer system with 400 watt amplifier
- Line output converter: 4-channel, with signal harnesses for 2018-2023 and 2024-current model years
- Amplifier mount and power harness: up to three MB Quart NA2/NA4 amplifiers
- Subwoofers: two 8 inch, frequency response 50Hz to 250Hz, sensitivity 89dB, 200W RMS each (MB Quart's kit list calls them 8 ohm subwoofers; its feature list gives a 4 ohm impedance)
- Subwoofer enclosure: rear underseat, HDPE, 1.0 cubic feet
- Subwoofer amplifier: 400 watt Class D
- Total system power: 400 watts
- Designed to add amplified speakers or bass while keeping the factory radio and speakers, via the line output converter
- Install: basic hand tools
- Color: Black; warranty: 1 year
- Manufacturer Part Number: MBQJT-SUB-ACC-1
Fitment
MB Quart lists this product for:
- Jeep® Gladiator (JT) 2020-Current
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
What is included in the MB Quart MBQJT-SUB-ACC-1?
MB Quart lists MBQJ-AMP-ACC-1 line output converter kit (4-channel LOC, signal and power harnesses, three-amp mount); MBQJT-SUBA-1 dual 8 inch underseat subwoofer system with 400 watt amplifier.
Which Jeeps does this package fit?
MB Quart lists Jeep® Gladiator (JT) 2020-Current.
Does it work with the factory radio?
Yes. The MBQJ-AMP-ACC-1 line output converter kit takes the signal from the factory system and includes a power harness that is plug-and-play with up to three MB Quart NA2/NA4 amplifiers.
Where do the subwoofers mount in the Gladiator?
Under the rear seat. MB Quart says the MBQJT-SUBA-1 uses OEM hardware, keeps full access to the jack and needs no floormat modification.
How does the MBQJT-SUB-ACC-1 compare with the MBQJT-SS-ACC-1?
The MBQJT-SS-ACC-1 is the related MB Quart accessory package with a different mix of soundbar and subwoofer. MB Quart's Stage packages instead replace the front speakers too, using the MBQJ-STG4A-1.
How hard is the install?
MB Quart lists basic hand tools and plug-and-play installation using OEM harnesses. Follow the install manuals for each component.
Why MB Quart
MB Quart builds vehicle-tuned audio packages for the Jeep 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.
Complete Your Jeep Gladiator JT Audio Package
Before ordering this Jeep Gladiator JT package, confirm your model year on the Fitment list. The amplification and line output converter kit are part of the package, so the factory radio stays in place. Questions about fitment? Contact Dunes 2 Dezert SXS before you buy.
