HEIGHT MODULE FOR MULTIDIMENSIONAL SOUND – The Polk Reserve R900 Height Module Loud Speaker, part of Polk Audio speakers, features a 1" Pinnacle Ring Radiator Tweeter & 4" Turbine Cone Woofer that deliver clear highs, smooth midrange & rich bass EXCEPTIONAL AUDIO – With Hi-Res Audio & Dolby Atmos Certification, the R900 home theater speakers support Dolby Atmos Height Virtualization, DTS, DTS:X, DTS Virtual:X & IMAX Enhanced, delivering immersive surround sound without ceiling speakers COMPLEMENTS ANY HOME THEATER SYSTEM - The R900 Height Modules are timber-matched to sonically complement other speakers in Reserve line and function as wall mount speakers or sit perfectly on top of R200, R500, R600, and R700 CAREFULLY ENGINEERED, ELEGANT DESIGN - Reserve Series cabinets for stereo speakers are carefully cross-braced to reduce resonances, while acoustically inert anti-diffraction magnetic grilles offer a clean modern aesthetic without sacrificing quality VERSATILE PLACEMENT OPTIONS - Compatible with other Polk series wall mounted speakers, the R900 can be placed as a "topper" or "on-wall" speaker. Flip the switch on the back to select the desired position and it will automatically adapt