Enter the world of exceptionally realistic, multidimensional sound with Polk Reserve Series R900 Height Module. Whether they are mounted on your wall or placed atop your Reserve Series loudspeakers, the R900s ensure exceptional 3D Dolby Atmos, DTS:X and IMAX Enhanced performance that makes you movies, music, and games sound incredible. The R900 is designed to deliver the 3D audio found in today's Dolby Atmos, DTS:X, and IMAX enhanced movie and music soundtracks. Once installed, the R900 height speaker module fires sound upwards, which is then reflected off the ceiling and back down to your listening area. As a result, you'll enjoy clear detailed three-dimensional sound without having to install additional speakers in your ceiling. Features the latest 1” high definition Pinnacle Ring Radiator Tweeter for clear, crisp highs without unwanted distortions, and a 4” Turbine Cone Driver that ensures accuracy and speed for a breathtaking level of depth and details. With a 2-way array, the R900 can be wall mounted or placed on top of a compatible Reserve speaker. Flip the switch on the back of the speaker to select the desired position and the speaker will automatically adapt to the optimal performance. It is compatible with all Reserve Series Speakers R200, R500, R600 and R700 speakers