Polk SDA speakers were the first true stereo speakers because they were able to maintain stereo separation all the way from the source to your ears. By acoustically isolating the two stereo channels, each ear hears only the correct stereo channel. The left ear hears left channel, and the right ear hears right channel. Recordings literally come alive in your listening room. Musical images are reproduced with clarity and pinpoint accuracy. You are immersed in an awe-inspiring three-dimensional sound stage that extends from wall-to-wall (width), floor to ceiling (height) and extends both in-front and behind the speakers (depth). Only with Polk SDA speakers can you hear all the spaciousness and life-like imaging of the original performance. More importantly, the image is neither smeared nor torn by excessively wide speaker positioning. Since SDA does not utilize any DSP or sound processing, it is 100% compatible with today’s home theater audio formats including Dolby Atmos, Dolby Atmos Virtualization Technology, DTS:X, DTS:X Virtual and IMAX Enhanced.