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Everything you love about Polk's Dynamic Balance technology-that rich, clean, full-range sound-is built into the marine-tough, yet ruggedly sophisticated, DB+ series. And with its universal fit, it can be installed in any vehicle: Automobiles, motorcycles, boats, ATVs-you name it. Features: (2) Polk Audio DB402 4" 270 Watt Car Audio Marine/ATV/Motorcycle/Boat Speakers High performance audio upgrade that delivers signature quality sound that goes beyond OEM factory systems Marine certified with IP65 rating (water- and dirt-resistant) and tested for salt-fog, UV and humidity Polypropylene and UV tolerant cone with waterproof inner and outer surrounds Simple drop-in installation for any vehicle including cars, boats, ATVs-you name it Zero tweeter protrusion and reduced mounting depth for a precise fit Dynamic Balance technology offers a rich, clean, full-range sound ¾", 20mm Tweeter ensures clear, balanced mids and highs 45 Watts at Continuous Power; 135 Watts at Peak Power Kicker 40KMMTES Mini Marine Wakeboard Tower Enclosures 4" empty enclosure Billet-aluminum mounting clamp construction Mini extension arm Durable terminal connectors For single and dual sets of drivers Weather-proof 9-degree axis rotation 7/8"-1-1/4" round tubing 1" square tubing