Poly-Planar Waterproof Marine VHF Radio Extension Speaker

Poly-Planar's MB-41-W is a compact, fully waterproof external VHF radio speaker designed to extend and clarify marine communications without adding music fidelity.

This 4.6-inch square marine-grade external speaker from Poly-Planar (model MB-41-W) is built to survive salt, spray, and sun while routing VHF transmissions to remote locations on your vessel. It’s purpose-built for clear voice reproduction on marine radios, not for high-fidelity audio, and ships as a single unit with a mounting bracket for easy installation.

How does this speaker hold up in harsh marine environments?

The MB-41-W is engineered to resist the corrosive effects of saltwater and outdoor exposure. Materials and construction focus on durability so the speaker maintains function after prolonged marine use.

• Fully waterproof and corrosion-proof construction
• Stainless steel grille and sturdy plastic frame
• Polypropylene cone and Teflon-coated wires for longevity
• Mounting bracket for secure, weather-resistant installation

Will this speaker improve VHF radio clarity on my boat?

Yes — the MB-41-W is tuned for voice frequencies typical of VHF marine radios, improving intelligibility at remote helm stations or cockpit areas. Keep in mind it’s optimized for speech rather than music fidelity.

• Frequency response focused on 1 kHz to 10 kHz for clear voice reproduction
• 83 dB ±3 dB sound pressure level for audible output without distortion
• 4 ohm impedance compatible with many marine radio remote outputs
• Peak power handling of 20 watts per pair when paired with compatible outputs

How easy is installation and where can I mount it?

The compact 4.6-inch square footprint and included mounting bracket make placement flexible and straightforward. It can be surface-mounted on consoles, cabins, or any exterior helm location where a remote VHF speaker is needed.

• 4.6" square speaker size fits small mounting spaces
• Bracket allows tilt and swivel adjustments for optimal directionality
• Teflon-coated wiring improves routing through wet environments
• Designed as a single-unit remote speaker; not supplied in boxed pairs

What electrical specs and limitations should I know?

The MB-41-W suits typical marine VHF systems but isn’t intended for stereo audio or high-power music setups. Check compatibility with your radio’s remote speaker output and observe the impedance and power handling ratings.

• Speaker impedance: 4 ohm — match to the radio’s specifications
• Peak power handling: 20 watts per pair (single-unit usage follows radio output limits)
• Frequency range: 1 kHz to 10 kHz, optimized for voice
• Not marketed as a music-grade speaker; designed for communications

Who is this for? The Poly-Planar MB-41-W is ideal for boat owners, captains, and crews who need a rugged, weatherproof remote VHF speaker to improve radio intelligibility at secondary helm positions, cockpits, or flybridges. Choose this unit if you want a compact, corrosion-resistant external speaker specifically tuned for marine voice communications rather than high-fidelity music playback.