MB Quart Stage 4 Audio System for Jeep Wrangler JL 18-23/Gladiator JT 20-26 - 422642

MB Quart Stage 4 Audio System for Jeep Wrangler JL 18-23/Gladiator JT 20-26 - 422642

Take your Jeep’s sound system to the next level with the MB Quart MBQJ-STG4A-1 STAGE 4 Audio Upgrade Kit, engineered exclusively for Jeep Wrangler JL (2018-2023) and Gladiator JT (2020-2026). Designed to work with OEM factory radios and requiring a rear speaker kit or soundbar for complete coverage, this system delivers powerful, balanced, and precise sound performance on any road or trail.

This all-in-one kit comes with a premium 4-speaker set: two 3.5-inch coaxial speakers with 0.75-inch magnesium dome tweeters for crisp highs, and two 6.5-inch midbass drivers with polypropylene/mica blend cones for strong midrange response. The system is driven by dual 400-watt NA2 Class-D compact amplifiers with on-board equalization, producing 800 watts of peak output in a high-efficiency, compact design. Optimized crossover networks (12dB midrange / 6dB tweeter) ensure every detail is tuned for clarity, depth, and full-range audio that cuts through road noise and outdoor conditions.

Built for rugged environments, the MBQJ-STG4A-1 features durable composite mounting enclosures, a powder-coated amplifier plate, and high-quality speaker materials built to withstand demanding Jeep and truck use. Installation is quick and straightforward thanks to plug-and-play OEM harnesses and factory-specific mounting, eliminating the need for custom fabrication while ensuring a perfect fit.

With a frequency response of 75 Hz–23 kHz, sensitivity of 89 dB, and a sleek black finish that blends with Jeep interiors, this kit delivers both performance and style. Dimensions measure 22.24 x 18.34 x 10.59 inches with a total weight of 26 pounds. Backed by MB Quart’s heritage of German engineering, the STAGE 4 Jeep upgrade kit offers reliable power, premium sound quality, and long-lasting durability for your vehicle.

Features

• Stage 4 Audio system designed for OEM Source Unit engineered for Jeep Wrangler JL (2018-2023) and Gladiator JT (2020-2026) models
• Uses OEM source unit, and requires rear speaker kit or soundbar
• 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
• Includes dual 400-watt NA2 Class-D compact amplifiers engineered for high efficiency and reliable performance
• On-board equalization provides balanced sound tuning with 800 watts total peak output
• Plug-and-play OEM harnesses and composite mounting enclosures for factory Jeep locations with no custom fabrication required
• Optimized crossover network (12dB midrange / 6dB tweeter) delivers clear highs, strong midrange detail and balanced full range sound
• Rugged construction with high-quality cones, tweeters, and enclosures built to withstand demanding driving conditions
• Works with OEM factory radios; requires rear speaker kit or soundbar for full coverage
• Frequency response: 75 Hz – 23 kHz
• Sensitivity level: 89 dB
• Material: Metal, Plastic
• Color: Black
• Dimensions (L x W x H): 22.24 x 18.34 x 10.59 inches
• Weight: 26 pounds
  

What our Experts Think

• Complete Jeep audio transformation: The MB Quart Stage 4 Audio System is engineered for 2018–2023 Jeep Wrangler JL and 2020–2026 Gladiator JT models, delivering a major upgrade over factory sound systems.
• High-performance speaker combination: Includes 3.5" coaxial speakers with magnesium dome tweeters and 6.5" midbass drivers for clearer highs, stronger vocals, and deeper midrange impact.
• Powerful built-in amplification: Dual 400-watt NA2 Class-D amplifiers provide efficient power delivery with 800 watts total peak output for louder, cleaner audio in demanding Jeep environments.
• Precision sound tuning: Integrated equalization and optimized crossover networks help create a balanced full-range listening experience with improved detail and sound staging.
• Jeep-friendly installation: Factory-style mounting enclosures and plug-and-play OEM harnesses allow a cleaner installation without extensive custom fabrication.
• Built for open-air adventures: Rugged components and durable construction help maintain strong performance during off-road driving, top-down cruising, and everyday use.
• Expert recommendation: An ideal choice for Jeep owners seeking a premium, high-output audio upgrade with factory-like fit, powerful amplification, and improved clarity on every trail or highway drive.

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