MS40B Black 4" Marine Speakers + MUD50.2 Amplifier Bundle
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Rockville
MS40B Black 4" Marine Speakers + MUD50.2 Amplifier Bundle
MS40B Black 4" Marine Speakers + MUD50.2 Amplifier Bundle
4" IP56 Marine Speakers, 1 Pair, Compact 2-Channel Amp, Weather-Resistant
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Regular price
$169.95
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$169.95
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Features
- Compact IP56 4" speakers with UV-safe grills
- MUD50.2 Class D 2-channel amplifier
- Fixed 80 Hz HPF for clean mids/highs
- Moisture-resistant design and pigtail wiring
- Mounting screws and clips included
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What's Included in the box
- Pair Rockville MS40B 4" marine speakers (Black)
- MTX MUD50.2 2-channel amplifier
- Speaker mounting screws and speed clips
- Amplifier wiring pigtail
- Basic installation hardware
SKU: SKU: MS40B+MUD50.2
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Product Description
A minimalist, weather‑ready upgrade for powersports and marine sound. The IP56 4" speakers deliver crisp highs and balanced mids, while the compact Class D amp fits tight spaces and runs cool. Fixed 80 Hz HPF trims low‑end resonance for cleaner output on bars, dashes, or cabins. Ideal for clean, reliable audio on small boats, ATVs, UTVs, and carts.
This Bundle Includes

MS40B
Rockville MS40 4" marine speakers deliver 200W peak power and waterproof durability in a sleek design. With anti-UV ABS construction, rustproof hardware, and a polypropylene cone, these speakers provide clear, powerful sound and lasting performance—ideal for boats, outdoor spaces, or car audio systems.
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MUD50.2
The MTX MUD50.2 delivers dependable 2-channel power for outdoor audio systems exposed to harsh conditions. Compact sizing, full-range Class D performance, and weather-resistant construction make it ideal for UTVs, ATVs, motorcycles, and marine setups where space, durability, and sound clarity matter most.
Features
Space-Saving Power
Micro chassis Class D amplifier supplies stable output with low heat in cramped installs.
Outdoor Durability
IP56 drivers and conformal‑coated electronics resist spray, dust, and UV exposure.
Tuned for Clarity
Fixed 80 Hz high‑pass filtering focuses power on mids and highs for articulate sound.
Simple Integration
High/low‑level inputs and pigtail harness ease connection to factory or add‑on sources.
Clean Aesthetics
Low‑profile speaker design blends with cabins and pods for a refined, factory‑like look.

Technical Specifications
- Product Type 4" marine speaker and compact amplifier bundle
- Speaker Power (Peak/Pair) 200 W
- Speaker Power (RMS/Pair) 50 W
- Impedance 4 ohm
- Frequency Response 122 Hz–20 kHz
- Sensitivity 85 dB @1W/1m
- Waterproof Rating IP56
- Amplifier Power 50 W x2 @2Ω, 25 W x2 @4Ω
- Amplifier Crossover Fixed HPF @80 Hz, 12 dB/Oct
- Inputs High and low level
- Weight Speaker ship wt 1.76 lb (pair)
- Dimensions Amp 3.64 x 2.85 x 1.73 in; Speaker cutout 3.66 in