The Polk Atrium 6 All-Weather Outdoor Speaker features a 1” Tweeter and a 5.25” Dynamic Balance Driver that deliver high-quality, rich audio that takes your movies and music to the next level. Additionally, the Polk Power Port Bass venting offers clean, noise-free bass. Features a durable, mineral-filled polypropylene cabinet design, with molded-in bracing, that allows the speaker to withstand years of seasonal changes. The rugged, mineral-filled polypropylene enclosure features a rustproof aluminum grille, rustproof aluminum bracket, and stainless steel/brass hardware. Polk Audio All-Weather Certified, the Atrium Series speakers exceed baseline industrial and military specifications for environmental endurance so that they can effortlessly withstand the outdoors and hold up in extreme temperatures and precipitation. The Atrium 6 can be mounted either horizontally or vertically for the best possible sound in a variety of situations The integrated brackets provide full 180-degree rotation (when mounted vertically or horizontally). You can remove the bracket and use the speaker's built-in stability feet if you simply want to place the speaker on a table or shelf.