The Reserve Series R100 bookshelf speaker utilizes a two-way driver design featuring the 1" Pinnacle ring radiator tweeter and 5.25" Turbine cone woofer to deliver ultra-clear highs, detailed midrange and effortless bass for your music, movies, and video games. Polk’s patented X-Port offers distortion-free, rich bass in a wide soundstage. R100 is Hi-Res, Dolby Atmos and IMAX Enhanced Certified.