180 Degrees Speed-Lock Mounting SystemSpeed-Lock Mounting, the easiest, fastest and safest of all mounting systems. Simply mount the bracket and click the speaker into place. Aim it and tighten it down. | Broad Coverage Baffle Design Fills Large Outdoor SpacesBroad coverage baffle design fills a large open outdoor space with big, full-range sound. The Atrium 4 has a more steeply-angled baffle design that maximizes critical mid- and high-frequency dispersion over a large area, without sacrificing detail. | Aluminum with Stainless Steel and Brass HardwareGold-plated 5-way binding posts for the most secure, dependable hookups. Aluminum grilles and bracket, with stainless steel and brass hardware: No rust. Ever. |