Ultimate outdoor loudspeaker, the Atrium®8SDI offers uncompromising performance for all your outdoor spaces. This is the outdoor loudspeaker without equal that can do it all, create a true stereo listening experience and deliver the kind of bass you’d expect to hear only from an indoor system. 16.51cm long-throw aerated polypropylene cone driver with butyl rubber surround pumps out surprising bass response from a compact design. Two 1-inch (24.5mm) anodized aluminum dome tweeters with rubber surrounds and neodymium magnets offer better power handling, smoother response and greater accuracy. Dual tweeter array with stereo tweeter aiming creates excellent imaging, whether used as a single stereo speaker, or as half of a stereo pair. Patented water-resistant PowerPort bass venting efficiently adds 3dB of big, realistic, musical bass output. And because it’s Polk all-weather certified water-resistant, it can go practically anywhere with no worries about moisture impeding its performance. Dual voice coil, Dynamic Balance® aerated polypropylene cone with rubber surround for greater power handling and better efficiency. Single/dual input switch. Combined with its ingenious dual tweeter array, this switch enables the Atrium8SDI to be used either as a single high-performance stereo loudspeaker, or the left-or-right speaker in a high performance stereo pair. Broad coverage made possible by a more steeply-angled baffle design that maximizes critical mid- and high-frequency dispersion over a large area, without sacrificing the detail. Gold plated 5-way binding posts for the most secure, efficient hookups. Available in durable, weatherproof black or white paintable finishes.