Patented Dynamic Balance® Whether you’re lounging in your favorite chair, hosting a BBQ, or spending time with the family outdoors, you won’t miss a single word of your favorite tunes. The Atrium Series outdoor speakers deliver crisp, powerful vocals—without distortion. Their Patented Dynamic Balance® and Klippel Optimization Technologies ensure optimal material performance, eliminating driver and tweeter “artifacts” for more realistic sound reproduction at high and low volume levels. Polk All-Weather Certified Made to withstand the elements, these speakers are built to last and produce rich, lifelike, space-filling sound—no matter the weather. Atrium Series speakers exceed baseline industrial and military specifications for environmental endurance (ASTM D5894-UV Salt Fog, Mil Standard 810 Immersion, Mil-Std 883 Method 1009.8 for salt and corrosion). Speed-Lock™ Mounting System Sprucing up the patio or backyard is a cinch with easy, secure one-handed installations even in difficult locations. The Speed-Lock Mounting System ensures easy, safe one-handed installations and no-slip setting of the speaker angle. This greatly simplified mounting procedure means fewer parts and a quicker setup. Paintable Finishes Available in durable, weatherproof black or white paintable finishes, Atrium speakers are easy to integrate into any décor. And with Aluminum Grilles and Bracket, stainless steel and brass hardware, these speakers will remain rust-free for years to come. Specifications Driver Complement 5″ (127mm) mineral filled Dynamic Balance polymer cone, rubber surround, 3/4″ (19mm) anodized aluminum dome tweeter w/ rubber surround and neodymium motor structure Frequency Response 60Hz-25kHz Recommended Power 10-100W continuous Impedance Compatible w/ 8 Ohm outputs Efficiency (dB 1w/1m) 90dB Environmental Standards ASTM D5894-UV Salt Fog, Mil Standard 810 Immersion, Mil-Std 883 Method 1009.8 for salt and corrosion & Polk Audio Certification Cabinet material Mineral filled polypropylene Grille & Bracket powder coated aluminum Hardware Brass or stainless steel Terminals Gold plated 5-way binding posts Mounting Options 180° Speed-Lock mounting Dimensions (w/ bracket & knobs) 10 5/16″ H x 6 3/4″ W x 7 3/4″ D (26.2cm H x 17.1cm W x 19.7cm D) Product Weight 2.09kg (each) Shipping Weight 5.0kg (pair) Specifications, dimensions and features subject to change without notice. Package Contents: Polk Audio Outdoor Speaker Atrium 5, Black, 2Pcs; x2 Mounting brackets; Manual.