High-performance floor-standing loudspeaker for the enjoyment of high-resolution movie and music sound. Features: High-Performance Full-Range Hi-Fi Home Theater Tower Loudspeaker Powerful & Immersive Hi-Res Audio for Movies, TV, Music & Games Polk Dynamic Balance Cascading Crossover Acoustic Array for Spacious, Lifelike Soundstage 1” High-Resolution Terylene Tweeter for Crystalline High Frequencies (40kHz+) Two 6.5” Mica-Fortified Polypropylene Woofers for Articulate and Dynamic Mids & Bass Patented Polk Power Port Technology for Effortless Bass (<40Hz) High Sensitivity for Compatibility with Most Amplifiers and AV Receivers (4O & 8O) Hi-Res Audio Certified and Dolby Atmos & DTS:X Compatible Gold-Plated Binding Posts, Damped Cabinet & Anti-Diffraction Grille for Pure Sound Patented Quality Testing Process Backed by a Limited Five-Year Warranty Culmination of Five Decades of American Loudspeaker Engineering (Est. 1972) Hear More Detail in Music and Movies You Love ES55’s Hi-Res Audio Certified, Terylene dome tweeter provides crystalline highs (40kHz+) ideal for enjoying high-resolution music from services like Apple Music, Tidal, Amazon Music HD, Qobuz, and Spotify HiFi, along with the soundtracks of the latest Ultra HD movies. Make Your Entire Listening Room the Sweet Spot You’ll experience a seamless, lifelike soundstage no matter where you’re seated thanks to Signature Elite ES55’s Dynamic Balance polypropylene woofers and 2.5-way cascaded crossover array. Effortless Bass Polk’s patented Power Port design provides greater surface area and smoother airflow for more output and less distortion compared to conventional ported speakers. When paired with the ES55’s dual 6.5” woofers, that means the effortless bass you can feel. High Sensitivity and Maximum Compatibility ES55 Towers deliver spacious, clear, enveloping, and realistic sound reproduction from nearly any amplifier or receiver— whether 4 or 8 ohms, vintage audiophile, or the latest Dolby Atmos or DTS:X surround sound AVRs.