Rockville 5.25" Marine Boat Speakers IP56 4Ω

Rockville MS525B are compact 5.25" marine speakers engineered to deliver powerful, weatherproof sound on boats and outdoor vehicles.

These two-way speakers combine a polypropylene woofer, a 1" PEI-diaphragm tweeter, and a robust marinized enclosure to produce clear audio from 110Hz–20kHz while resisting salt, spray, and UV. Rated IP56 and fitted with rustproof ABS grills and baskets, the MS525B pair offers 400W peak (200W RMS per pair) with a 4-ohm impedance that works well with most marine and outdoor stereos. Compact dimensions and included mounting hardware simplify installation in tight locations onboard or in recreational vehicles.

How loud and detailed will these speakers sound on my boat?

The MS525B pair provides punchy midbass and crisp highs thanks to a polypropylene cone and a 1" ASV voice coil driving 87dB sensitivity. The PEI tweeter with an NdFeB magnet handles high frequencies for articulate treble without sounding harsh at moderate volumes. Together they cover a wide band so music and dialogue remain intelligible even over wind and waves.

• 400W peak / 200W RMS per pair (100W each)
• Frequency response: 110Hz–20kHz
• 87dB ±2dB sensitivity for efficient output
• 1" PEI tweeter with NdFeB magnet for clear highs

Will these speakers survive marine conditions and outdoor use?

Yes — the MS525B are built specifically for harsh environments with an IP56 rating to resist water spray and dust ingress. All exposed parts use anti-UV, rustproof ABS, and internal components receive marinization to prevent corrosion from salt and freshwater. That makes them suitable for open boats, pontoons, and other outdoor vehicles where exposure is frequent.

• IP56-rated against water spray and dust
• Rustproof, anti-UV ABS grill and basket
• Marinized internal components for salt tolerance
• Stainless steel mounting hardware included

How easy is installation and what space do they need?

Installation is straightforward: the compact footprint fits many factory locations and aftermarket panels, and the package includes screws, speed clips, and a template to simplify cutting and mounting. With a total diameter under 5.8" and a shallow 1.85" mounting depth, these speakers work where larger drivers won’t fit. Their 4-ohm impedance ensures compatibility with most marine amplifiers and head units.

• Total diameter: 5.79" and cutout diameter: 5.31"
• Mounting depth: 1.85" — fits tight cavities
• Includes template, speed clips, and stainless screws
• 4-ohm impedance for broad compatibility

What technical details should I know before buying?

The MS525B use a 6 oz Y30 ferrite magnet and offer a resonant frequency around 120Hz for reliable low-mid performance given their small size. The design balances power handling and sensitivity so the pair performs well with typical marine amplifiers without excessive power draw. They are optimized for real-world boating scenarios rather than studio reference listening.

• 6 oz Y30 ferrite magnet and ASV voice coil
• Resonant frequency (F0) ≈ 120Hz, Fs 142Hz
• 4-ohm impedance and 87dB sensitivity
• Peak handling: 400W per pair

Who is this for? Boaters, RV owners, and outdoor-vehicle enthusiasts who need compact, weather-resistant speakers that deliver better-than-stock sound without complex installation will find the Rockville MS525B an effective upgrade. They suit cockpit and cabin locations where space is limited but durability and clear, energetic audio are required. If you want a balance of marine-grade protection, easy fitment, and impactful sound for day-to-day recreational use, these speakers are a practical, cost-conscious choice.