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Patented SDA® Surround technologyOhGizmo! » Archive » Polk Audio’s New SurroundBar50 Provides Surround Sound from One Speaker
Our patented SDA® Surround technology means there’s no need to install rear speakers. SDA Surround creates a completely immersive 5 channel surround experience, as if there were dozens of speakers all around you. This technology is based on fundamental research into the way our ears process sound and perceive the direction of sounds.