Polk Audio's compact, Speed-Lock-equipped, and all-weather-certified Atrium speaker series ensures high-fidelity audio performance that's easy to harness in any outdoor installation environment. Packed with premium polypropylene woofers and an anodized aluminum dome tweeter, Atrium offers nothing less than pure, authentic audio with ample response and low-end thump. Likewise, patented Dynamic Balance minimizes sound artifacts for disturbance-free sound at any volume level. Looking to install these speakers yourself? Thanks to the Atrium's onboard Speed-Lock mounting system, installation is a cinch in any environment, ensuring you find the best position for your speakers with minimal setup hassle. Take it from Sweetwater's audio contingent: for an outdoor audio system that guarantees quality sound, you can't go wrong with Polk Audio's Atrium.