BOSS Audio Systems 6x9 Marine Speakers MR690 350W Coaxial

The BOSS Audio Systems MR690 are 6x9-inch weatherproof, full-range coaxial marine speakers delivering up to 350 watts per pair for clear, durable sound on boats and open-air vehicles.

Designed for marine and outdoor use, the MR690 combines a polypropylene cone, resin-treated cloth surround and a composite basket to resist moisture and corrosion while reproducing a broad 60Hz–20kHz frequency range. These 2-way speakers include a 13 mm dome tweeter for improved high-frequency detail and a 4 ohm impedance that pairs easily with many marine receivers and amplifiers. The package balances robust power handling with practical installation dimensions so you can upgrade your vessel’s audio without compromising space or durability.

How do the MR690 speakers perform in wet and salty conditions?

The MR690 uses materials chosen to withstand marine environments—moisture-resistant surrounds, corrosion-resistant baskets and weatherproof components help maintain performance in damp, salty air. While built for harsh conditions, protecting wiring and connectors will extend lifespan and maintain audio quality.

• Resin-treated cloth surround resists water absorption and tears
• Polypropylene cone sheds moisture while remaining lightweight
• Composite basket minimizes corrosion from salt spray
• Weatherproof construction suitable for open-boat installations

What sound should I expect from these 6x9 speakers?

The MR690 delivers full-range sound with a profile that emphasizes clarity across lows, mids and highs. The 2-way coaxial design integrates a 13 mm dome tweeter to produce crisp highs, while the larger 6x9 cone provides punchy midbass suitable for music genres from rock to electronic.

• Frequency response: 60Hz–20kHz for broad tonal coverage
• 2-way system improves clarity and stereo imaging
• 350W max power handling allows higher volume peaks
• 4 ohm impedance for compatibility with many receivers

Will the MR690 fit my existing speaker openings and how deep are they?

These speakers are sized to retrofit many common 6x9 mounting locations but always verify your cutout before purchasing. The MR690’s overall diameter and mounting hole dimensions are provided so you can match them to your dash or speaker panel; the mounting depth is moderate for most boat dash and door spaces.

• Overall diameter: 7.72" x 10.59" (196 x 269 mm)
• Installation hole diameter: 6" x 8.78" (152 x 223 mm)
• Mounting depth: 3.38" (86 mm) — check clearance behind panel
• Consider grille fit and surface contour before cutting

What warranty and installation guidance does BOSS provide?

BOSS Audio Systems backs the MR690 with a three-year platinum online dealer warranty when purchased through Amazon.com. For reliable performance and safety, BOSS strongly recommends professional installation to ensure correct wiring, secure mounting and long-term durability.

• 3-year platinum online dealer warranty via Amazon purchases
• Professional installation recommended for best results
• Follow marine wiring best practices and corrosion protection
• Keep documentation and proof of purchase for warranty claims

Who is this for? The MR690 is suited for boat owners, marine vehicle enthusiasts and anyone seeking weather-resistant, high-output 6x9 speakers that balance affordability with durable construction. If you need speakers that will endure exposure to moisture while delivering fuller low end and clear highs for dockside parties, inland waterways or open-deck cruising, these coaxial marine speakers are a practical upgrade. Confirm fitment and consider professional installation to take full advantage of the power handling and warranty coverage.