Polk Legend L900: Premium Height Speaker Module is designed to deliver the 3D audio found in Dolby Atmos Dolby Atmos height Virtualization DTS DTS:X DTS Virtual:X and IMAX enhanced soundtracks. Seamlessly integrates into the L600 and L800 floorstanding loudspeakers. Polks goal since its founding has been to build great loudspeakers that virtually transforms the listeners room into the scene of the recorded performance. To meet this challenge Polk engineers and designers must constantly innovate and agonize over every detail. Nothing is left to chance and nothing unnecessary is ever added. The results are best-in-class loudspeakers that outperform their competition for half the price earning numerous awards patents and most importantly Polk speaker owners that swear by the brand. Dont take our word for it go listen and youll believe. The Legend L900 Height Module is Dolby Atmos certified and designed to meet DTS:X specification. Traditional height speakers and toppers orient their tweeter and woofer vertically resulting in a small sweet spot and can leave you underwhelmed. The L900 Height Modules horizontal orientation ensures both the phase and time alignment for the tweeter and the woofer deliver a large sweet spot for a truly immersive experience.