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The flagship of the line the Atrium8SDI has a unique patented Single/Dual Input Switch that combined with its ingenious dual tweeter array enables you to use the Atrium8SDI as either a single high performance stereo loudspeaker or the left-or-right speaker in a high performance stereo pair. And you can use it practically anywhere because the Atrium8SDI also has special military spec waterproofing features including the patented water-resistant PowerPort bass venting. A Polk perfected method of analyzing a speaker’s microscopic behavior with laser Interferometer. Polk engineers can tune out unwanted resonance and distortion with the right combination of materials geometry and construction techniques. This brings you pure distortion-free sound. PowerPort technology allows Polk Audio speakers to deliver more deep musical bass than you’d expect from a moderately-sized loudspeaker. It’s the kind of realistic bass that reaches out and grabs you shakes your behind on the seat and adds true depth and visceral emotional power to your music and movie experiences. By using a state-of-the-art Klippel distortion analyzer Polk engineers were able to optimize the woofer’s motor structure voice coil alignment and suspension bringing you the best possible performance even at extreme listening levels.