PowerPort® Bass Venting You’ll experience space-filling sound in any outdoor area, porch, sunroom, or deck. Polk’s patented water-resistant PowerPort® efficiently adds 3dB of big, realistic, musical bass output. And when combined with its anodized aluminum tweeter domes, this speaker not only delivers powerful, high-quality sound output, but excellent midrange clarity. 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. Specifications Driver Complement 5 1/4″ (133mm) Dynamic Balance aerated polypropylene cone, rubber surround, 1″ (25mm) anodized aluminum dome tweeter w/ rubber surround and neodymium motor structure Frequency Response 50Hz-27kHz 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 mmersion, Mil-Std 883 Method 1009.8 for salt and corrosion & Polk Audio Certification Cabinet material Mineral filled polypropylene Grille & Bracket material powder coated aluminum Hardware Brass or stainless stee Terminals Gold plated 5-way binding posts Mounting Options 180° Speed-Lock mounting Dimensions (w/ bracket & knobs) 11 11/16″ H x 7 11/16″ W x 8 3/4″ D (26.2cm H x 17.1cm W x 19.7cm D) Product Weight 2.45kg (each) Shipping Weight 7.0kg (pair) Specifications, dimensions and features subject to change without notice. Package Contents: Polk Audio Outdoor Speaker Atrium 6, Black, 2Pcs; 2 mounting brackets; Manual.