The compact Atrium 4 outdoor outdoor wired speakers produce high-fidelity sound quality anywhere you want great sound. The small size of the powered speakers makes it ideal for tight, out-of-the-way installations. With an aluminum dome tweeter and polypropylene cone driver in each speaker, enjoy deep, accurate bass and smoother response. Polk’s patented Dynamic Balance and Klippel Optimization technologies ensure perfect material performance, eliminating driver and tweeter “artifacts” for more realistic sound reproduction at high and low volume levels. The weatherproof outside speakers feature a rustproof aluminum grille, rustproof aluminum bracket, and stainless steel/brass hardware that can endure seasonal change and deliver indoor speaker-quality audio for years of outdoor listening enjoyment. Quick and easy to install with Polk’s Speed Lock Mounting system.