Rockford Fosgate X317-STAGE4 400 Watt Stereo Kit for Maverick X3

In this review the Rockford Fosgate X317-STAGE4 kit is evaluated as a full audio upgrade for Maverick X3 models from 2017 to 2020. The bottom line: this kit is for riders who want a complete, vehicle-specific sound system with strong low end and easy integration. It combines a compact marine tuner, front and rear Prime Marine speakers, an under-seat subwoofer enclosure, and a 400 Watt Class-AD amplifier so you get balanced clarity and serious bass without fabricating custom mounts.

Key Features

• Complete integration: The RFX3-PMXDK dash kit and plug-and-play wiring harness make the PMX-2 receiver install cleanly into the Maverick dash with the hardware included.
• Marine-rated components: The PMX-2 tuner and Prime Marine speakers are designed to resist moisture and dust, which helps keep reliable performance when riding off-road.
• Compact high-efficiency amplification: The Power TM400X4ad amplifier delivers consistent output at both 4-Ohm and 2-Ohm loads, providing stable power for speakers and subwoofer in a small footprint.
• Purpose-built sub enclosure: The RM110D2B sub and RFX317-FEW under-seat enclosure are molded for the Maverick X3, giving tight bass without sacrificing cargo or foot space.
• Rear fill included: The RM1652W-MB rear speakers in a sealed enclosure add rear soundstage so passengers and riders feel more immersed in music on trails or dunes.

Who It's For

This kit is aimed at Maverick X3 owners who want an out-of-the-box, vehicle-specific audio upgrade that covers head unit, front and rear speakers, plus a powered subwoofer system. It suits riders who value sound quality and durability on off-road rides and who prefer a single kit that includes dash hardware, enclosures, clamps, and wiring harnesses.

Less suitable are buyers who want a barebones speaker swap, those who need a minimal lightweight system for racing where weight is critical, or users who require a different head unit form factor than the included PMX-2. Also note the antenna is not provided, so plan for that during installation.

Pros & Cons

Pros

• Very complete package: receiver, front and rear speakers, subwoofer, amp, enclosures, dash kit, and harnesses all included.
• Excellent sound quality and component quality reported by customers, with clear highs and strong low end from the under-seat sub.
• Marine-grade parts and custom-molded dash and enclosures reduce installation guesswork and increase durability outdoors.

Cons

• Not fully plug-and-play for every requirement: antenna is not included, so buyers must source that separately.

Specifications

Kit Name	X317-STAGE4
Power	400 Watt 4-channel amplifier (TM400X4ad)
Head Unit	PMX-2 Prime Marine AM/FM/WP tuner with 2.7in TFT
Front Speakers	RM1652B 6.5in Prime Marine full range pair
Subwoofer	RM110D2B 10in dual 2-Ohm in RFX317-FEW under-seat enclosure
Rear Speakers	RM1652W-MB 6.5in sealed enclosure pair
Installation Hardware	RFX3-PMXDK dash kit, RFX3-K8 harness and mounting bracket, PM-CL2B clamps

Our Verdict

The X317-STAGE4 is a thoughtfully composed, vehicle-specific audio kit that delivers clear highs, robust bass, and simplified installation for Maverick X3 owners. It represents strong value for those who want a complete, durable upgrade without fabricating mounts, though buyers should budget for a compatible antenna if needed.

Frequently Asked Questions

Is this kit compatible with Maverick X3 models?
Yes, the kit is built specifically for Maverick X3 models from 2017 to 2020 and includes dash and enclosure parts molded for that vehicle.

Does the package include a head unit?
Yes, the PMX-2 Prime Marine AM/FM/WP tuner with a 2.7in full color TFT display is included.

Are all installation parts provided?
Most hardware, harnesses, clamps, and mounting brackets are included, but the antenna is not supplied and must be obtained separately.