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Polk Atrium 4 - Pair Weatherproof Outdoor Speakers Experience big, high-fidelity sound from a compact, weatherproof speaker designed for any outdoor space. The Polk Atrium 4 delivers rugged, reliable performance year-round, perfect for patios, poolsides, kitchens, and backyards. Key Features 4 1/2-inch (11.43cm) long-throw mineral-filled polypropylene cone driver with butyl rubber surround for deep bass response 3/4-inch (19mm) anodized aluminium dome tweeter with neodymium magnet for smooth, powerful highs Broad coverage baffle design maximises mid- and high-frequency dispersion over large outdoor areas Polk all-weather certified to exceed ASTM D5894-UV Salt Fog, Mil Standard 810 Immersion, and Mil-Std 883 Method 1009.8 for salt and corrosion resistance Speed-Lock™ mounting system enables easy, secure one-handed installation Durable mineral-filled polypropylene cabinet with moulded-in bracing for lasting sound quality Patented Dynamic Balance® and Klippel optimisation technologies for realistic sound at all volume levels Aluminium grilles and bracket with stainless steel and brass hardware ensure no rust Gold-plated 5-way binding posts provide secure, dependable connections Available in weatherproof black or white paintable finishes Specifications Driver: 4 1/2-inch (11.43cm) mineral-filled polypropylene cone with butyl rubber surround Tweeter: 3/4-inch (19mm) anodised aluminium dome with neodymium magnet Mounting: Speed-Lock™ system for easy installation Weather Resistance: Certified to ASTM D5894-UV Salt Fog, Mil Standard 810 Immersion, Mil-Std 883 Method 1009.8 Finish: Weatherproof black or white (paintable) About Polk All Polk products are crafted using premium materials and advanced manufacturing techniques. They undergo rigorous quality testing including drop tests, extreme signal response, UV and salt exposure to ensure a lifetime of performance.