MMR-4B | Marine Grade Head Unit w/ AM/FM Tuner, USB & Bluetooth

Power Acoustik MMR‑4B Marine Grade Bluetooth Head Unit with AM/FM/WB Tuner & USB

The Power Acoustik MMR-4 B is designed for boats, watercraft, and marine environments that require durability, functionality, and consistent audio quality. Built inside an IPX5-rated watertight housing, this marine head unit resists splashes, humidity, and vibration without sacrificing output power or connectivity.

This compact, marine-grade stereo supports Bluetooth A2DP for wireless streaming, allowing you to connect smartphones or media devices without the need for tangled cables. With a rear USB port supporting up to 64GB, it allows playback of MP3 and WMA audio files, as well as full ID3 tag support for displaying track titles and artist metadata.

The MMR‑4B is more than just waterproof—it’s acoustically versatile. It's built-in AM/FM/WB tuner captures both standard and weather band broadcasts, perfect for navigating offshore. EQ presets (POP, ROCK, CLASSIC) provide tonal shaping for various audio profiles, while 2V RCA preamp outputs (front and subwoofer) facilitate clean signal routing to external marine amplifiers and subwoofers.

At its core, a 300-watt, 4-channel MOSFET amplifier delivers crisp output directly to the speakers. The rear auxiliary input allows for integration with external media sources, such as satellite radios or marine-compatible MP3 players. Anti-shock circuitry ensures smooth playback, even in rough conditions.

Key Specs:

• Marine IPX5 sealed construction
• Bluetooth streaming with A2DP support
• USB media input (MP3/WMA up to 64GB)
• FM/AM/WB tuner with memory presets
• ID3 tag display for metadata readout
• EQ presets: Pop, Rock, Classic
• 2V RCA preamp outputs (rear and subwoofer)
• Auxiliary rear input
• 300W 4-channel internal MOSFET amp
• Super electronic anti-shock protection
• Unit size: 4.5" x 4" - Mounting cutout: 3" x 3.75"

Best Use Cases:

• Marine-grade audio system installations
• Compact Bluetooth stereo upgrades for boats
• Waterproof head unit replacements for jet skis, pontoons, or yachts
• Auxiliary receiver integration for rugged outdoor vehicles

Whether you're equipping a fishing boat, ski boat, or cruiser, the MMR-4 B delivers the connectivity and resilience required for marine conditions. Its compact form factor, rugged waterproof design, and flexible audio outputs make it a reliable component for custom audio builds in high-moisture environments.