UT65B 2-Pack + NA2-320.4 Bundle
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Rockville
UT65B 2-Pack + NA2-320.4 Bundle
UT65B 2-Pack + NA2-320.4 Bundle
6.5" IPX6 Rollbar Speakers, 4-Channel Marine Amp, Mounts
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Regular price
$359.89
Sale price
$359.89
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$0.00
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Features
- Marine-grade 4-channel Class D amplifier
- IPX6 6.5" speakers with two-way crossover
- Aluminum swivel brackets fit 1.5"–2" bars
- Sealed terminals resist water and salt
- Compact amp with quick disconnects
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What's Included in the box
- (2) UT65B 6.5" Rollbar Speakers
- MB Quart NA2-320.4 4-Channel Amplifier
- Swivel Mounting Brackets (1.5"–2")
- Installation Hardware
SKU: SKU: (2) UT65B+NA2-320.4
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Product Description
Deliver spirited, full-range sound across your side‑by‑side with IPX6 6.5" tower speakers and a compact 4‑channel marine amplifier. The system’s efficient Class D topology provides clean power and headroom, while weatherized enclosures and sealed connections maintain performance and polish in punishing conditions.
This Bundle Includes

UT65B
The UT65B delivers 400W peak and robust sound in a water-resistant, shockproof design. With 360° swivel aluminum brackets, rustproof hardware, and UV protection, these speakers are engineered for marine, UTV, and ATV use—offering premium audio and rugged durability for any outdoor adventure.
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NA2-320.4
The MB Quart NA2-320.4 delivers 320W RMS across four channels with clear, stable sound for Polaris RZR, ATV, and UTV applications. Rugged, water-resistant, and compact, it combines advanced pre-amp technology, thermal management, and quick-release connectors for adaptable, high-performance audio in any off-road environment.
Features
Confident Marine Power
Up to 4 x 80W @ 2Ω supplies authoritative output with cool-running efficiency and a small footprint.
Two-Way Precision
Built-in crossover, poly cones, and PEI tweeters render clear dialogue and energetic music at speed.
Durable By Design
IPX6 housings, UV-resistant grilles, and corrosion-proof hardware thrive in salt, spray, and sun.
Flexible Installation
360° swivel brackets fit common bar sizes, enabling exact aiming for an immersive cabin soundstage.
Service-Friendly
Quick-disconnect terminals simplify seasonal storage and upgrades without rewiring the vehicle.

Technical Specifications
- Type UTV/ATV Marine Speaker + 4-Channel Amplifier
- Water Resistance Speakers IPX6; Amplifier Water Resistant
- Amp Power 4 x 80W @ 2Ω; 4 x 40W @ 4Ω
- Amplifier Topology Full-Range Class D
- Frequency Response Speakers 60Hz–20kHz; Amp 20Hz–20kHz
- Mount Compatibility 1.5", 1.75", 1.875", 2" Bars
- Color/Finish Black Enclosures, Aluminum Brackets
- Weight Amp 2.16 lb; Each Speaker ~4 lb
- Dimensions Speaker 9.84" x 7.17" x 7.32"; Amp 3.70" x 5.51" x 1.77"