Command Your Marine Audio – JL Audio MM55 MediaMaster® Marine Source Unit

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Introduction

The JL Audio MM55 is a powerhouse marine digital media receiver designed to elevate your on-water audio experience with unmatched clarity, control, and durability. Built for boats and rugged outdoor environments, the MM55 delivers precise audio control across multiple zones, robust output, and seamless Bluetooth streaming, all wrapped in a compact, weatherproof package. With JL Audio’s legendary marine-grade reliability and clean interface, it’s the perfect foundation for any premium marine sound system.

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All-in-One Marine Audio Control

The MM55 simplifies and upgrades your boat’s audio system by combining source control, multi-zone management, and high-fidelity signal output into one sleek unit. It provides access to AM/FM radio, Bluetooth® audio streaming, and auxiliary inputs — all with easy-to-navigate controls on its sunlight-readable display. The intuitive layout and user-friendly interface make operating your marine sound system a breeze, even while underway.

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Multi-Zone Mastery

Equipped with three independent audio zones, the MM55 allows you to control different areas of your boat separately. Whether you want party volume at the stern and chill vibes in the cabin, or a completely isolated subwoofer in one zone — the MM55 makes it possible. Each zone includes dedicated subwoofer outputs and customizable tone, volume, and source controls, giving you complete audio command from a single unit.

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High-Performance Audio with Clean Output

While compact in size, the MM55 delivers big sound performance. It features preamp outputs for all three zones, making it ideal for pairing with JL Audio marine amplifiers. With high-quality internal components and clean signal routing, it ensures your audio system plays loud and clear without distortion. Whether streaming your favorite playlist or tuning in to a radio station, the sound remains crisp, full, and well-balanced.

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Bluetooth® Streaming with Low Latency

With built-in Bluetooth® audio, the MM55 lets you wirelessly stream music from any compatible smartphone or device. The connection is fast, stable, and optimized for excellent sound quality. Passengers can take turns being the DJ without needing auxiliary cables, making every outing more interactive and fun.

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Sunlight-Readable Display and Durable Design

The MM55 features a high-brightness color LCD screen, engineered to remain visible in bright daylight — crucial for boats with open cockpits or helm stations. The entire unit is IP67-rated for water and dust resistance, meaning it’s built to survive salt spray, rain, and harsh sun exposure without fading or malfunctioning. It’s not just waterproof — it’s marine-proof.

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Compact Size, Big Capability

Don’t be fooled by its sleek size — the MM55 is packed with capability. Its small footprint makes it easy to mount in tight spaces at the helm or cockpit, while still offering deep system control for serious audio setups. Whether you're retrofitting a center console or building a custom install on a yacht, the MM55 fits right in.

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Key Features

• Marine-Grade Media Receiver: Designed for harsh marine environments with IP67 weather resistance.

• Multi-Zone Audio Control: 3 zones with separate subwoofer outputs and tone controls.

• Bluetooth® Audio Streaming: High-quality wireless connection to mobile devices.

• Auxiliary and Line Inputs: Supports a variety of media sources.

• Color LCD Display: High-contrast, sunlight-readable screen for easy viewing.

• Full-Range Preamp Outputs: Ideal for powering external amplifiers with clean signal.

• Compact Mounting Footprint: Perfect for boats of all sizes and layouts.

• Simple, Intuitive Interface: Effortless control over sources, volume, tone, and zones.

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Why Choose the JL Audio MM55?

If you're looking to elevate your marine audio system with control, clarity, and customization — the JL Audio MM55 delivers. With advanced zone management, Bluetooth streaming, and a sleek marine-proof design, it brings premium sound and functionality to any boat. Whether you're hosting a party on deck or relaxing in the cabin, this unit gives you the tools to shape your sound exactly how you want it.

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What’s in the Box?

• 1 x JL Audio MM55 Marine Source Unit

• 1 x Trim Ring and Mounting Gasket

• 1 x Mounting Hardware Kit

• 1 x User Manual

• JL Audio Decal

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Specifications

• Display: 2.8” Full-Color LCD (Sunlight-readable)

• Zones: 3 Independent Zones w/ subwoofer outputs

• Output Type: Full-range preamp (RCA) for all zones

• Weather Rating: IP67 Water and Dust Resistant

• Connectivity: Bluetooth®, Aux Input, Line Input

• Mounting Dimensions (Cutout): 3.15" (H) x 3.74" (W)

• Power Requirements: 12V DC system

• Made in the USA

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FAQs

Does the MM55 have built-in amplification?

• No, it is a source unit with preamp outputs — designed to be paired with external marine amplifiers.

Can I stream music via Bluetooth®?

• Yes, it includes built-in Bluetooth® streaming, allowing wireless music playback from your phone or tablet.

Is this unit waterproof?

• Yes, the MM55 is IP67 rated, making it highly resistant to water, salt, UV rays, and dust — ideal for marine use.

How many zones does the MM55 support?

• It supports three independent zones, each with its own subwoofer control and tone settings.

Can I control the MM55 through a multi-function display?

• The MM55 is a standalone unit and does not feature NMEA 2000 integration like some higher-end models.

Does it support USB or SD cards?

• No, this model is designed for Bluetooth® and auxiliary line input, keeping things simple and reliable on the water.