Elevate Your Boat’s Audio with JL Audio M3-770X-C-Gw 7.7” Marine Speakers

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Introduction

The JL Audio M3-770X-C-Gw 7.7-inch marine coaxial speakers are designed to deliver rich, full-range sound that cuts through the wind and waves with clarity and depth. Whether you're anchored at a sandbar or cruising full throttle, these speakers offer stunning audio quality backed by durable construction made for life on the water. With their crisp white classic grilles and premium build quality, the M3-770X-C-Gw speakers bring style and sonic excellence to any boat.

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Larger Size for Louder, Deeper Sound

Unlike standard marine speakers, the M3-770X-C-Gw features an oversized 7.7-inch woofer, which allows for greater cone area and excursion. This design translates into louder output and improved bass response, ensuring your music is full and vibrant even in open-air settings. Whether you're listening to mellow yacht rock or heavy-hitting EDM, these speakers deliver the punch and clarity needed for any playlist on the water.

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Precision-Engineered 2-Way Design

Each M3-770X-C-Gw speaker includes a 0.75-inch silk dome tweeter mounted at the center of the woofer cone, creating a true 2-way coaxial configuration. This setup provides accurate high-frequency detail with smooth roll-off, avoiding harshness and fatigue. The result is a well-balanced soundstage with crisp highs, clear mids, and powerful lows — exactly what you'd expect from JL Audio's marine engineering team.

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Built for Harsh Marine Conditions

Every component of the M3-770X-C-Gw is carefully chosen to resist the elements. The UV-resistant classic white grille, polypropylene cone, and synthetic rubber surround are all designed to withstand long-term exposure to saltwater, sun, and moisture. JL Audio uses marine-grade materials and assembly techniques tested to IP65 standards, ensuring that these speakers keep sounding great even in the harshest environments.

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High-Efficiency Performance for Any System

These speakers are optimized for high output with modest power, making them a great match for both factory and aftermarket marine systems. With 70 watts RMS power handling and 4-ohm impedance, they perform beautifully whether powered by a head unit or a dedicated marine amplifier. Even at lower power levels, the M3-770X-C-Gw speakers maintain their clarity and bass depth, making them ideal for a variety of setups.

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Timeless Classic Grille Design

Aesthetically, the Classic White Grille (C-Gw) offers a clean, understated look that complements virtually any boat design. It blends seamlessly with traditional and modern marine interiors, making your upgrade look as good as it sounds. The grille is not just about looks — it’s rugged and UV-stable, built to last season after season.

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Key Features

• 7.7-Inch Marine Coaxial Speakers: Oversized design delivers superior loudness and bass depth.

• 2-Way Speaker System: Includes 0.75” silk dome tweeter for smooth, accurate highs.

• Marine-Rated Construction: Weather-resistant materials resist UV, saltwater, and moisture.

• Classic White Grilles (C-Gw): Stylish, UV-resistant design matches any boat aesthetic.

• 70W RMS / 225W Peak Power Handling: High efficiency works well with various amplifiers or head units.

• 4-Ohm Impedance: Easily integrates with most marine sound systems.

• Made in the USA: Built in JL Audio’s Miramar, Florida facility to exacting standards.

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Why Choose the JL Audio M3-770X-C-Gw?

If you're looking to upgrade your boat’s sound with premium speakers that can handle the marine environment while delivering stunning audio quality, the M3-770X-C-Gw is the answer. These speakers are engineered for larger boats, louder volumes, and better bass — all without requiring a bulky enclosure. Their stylish design and rugged durability make them a perfect choice for boaters who want more from their sound system, without compromising on reliability or looks.

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What’s in the Box?

• 2 x JL Audio M3-770X-C-Gw 7.7-Inch Marine Coaxial Speakers

• 2 x Classic White Grilles (pre-installed)

• Mounting Screws and Hardware

• User Manual

• JL Audio Decals

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Specifications

• Speaker Size: 7.7 inches

• Power Handling (RMS): 70 watts

• Peak Power Handling: 225 watts

• Frequency Response: 45 Hz – 25,000 Hz

• Impedance: 4 ohms

• Sensitivity: 90.5 dB @ 1W/1m

• Mounting Depth: 3.32 inches (84 mm)

• Cutout Diameter: 6.25 inches (159 mm)

• Grille Style: Classic White (C-Gw)

• Weather Rating: IP65 (marine certified)

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FAQs

Are these speakers loud enough for open-deck use?

• Yes! With their oversized 7.7-inch woofers, the M3-770X-C-Gw speakers deliver powerful, clear sound perfect for open-air environments.

Do I need a separate amplifier to run these?

• Not necessarily. While they’ll sound even better with an amplifier, these high-efficiency speakers perform very well with head units alone.

Are they truly marine-grade?

• Absolutely. These speakers are built with UV, salt, and moisture-resistant materials, and are tested to IP65 marine standards.

What’s the benefit of the larger 7.7” size?

• The extra size allows for deeper bass and higher output, outperforming standard 6.5” speakers without requiring more power.

Can I install these in factory speaker locations?

• In some cases, yes — but check your cutout diameter and depth to confirm compatibility with existing openings.

Do these come with grilles?

• Yes, each speaker includes a pre-installed Classic White Sport Grille, ready to mount.