The Polk Audio Signature Elite ES15 is a compact, Hi-Res Audio Certified bookshelf speaker designed for high-resolution sound in movies, music, and gaming. It features a 1-inch Terylene dome tweeter and a 5.25-inch mica-reinforced polypropylene woofer for detailed highs and clean, powerful bass. The speaker uses technologies like Dynamic Balance and Power Port for distortion-free audio and can be used as a surround or main speaker in a home theater system.