Powerful & Immersive Hi-Res Audio for Movies, TV, Music & Games Enjoy movies, music, and gaming with high-resolution, full-range hi-fi and cinematic sound. Polk’s high-performance ES20 bookshelf loudspeaker features a Dynamic Balance acoustic array, precision crossovers, and Power Port bass enhancing technology. Hi-Res Audio Certified and accessibly priced, Signature Elite ES20 fulfills the Polk promise of great sound for all. Hear More Detail in Music and Movies You Love ES20’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. Effortless Bass Power Port is a Polk-patented design that smoothly transitions the air flow from the speaker’s port into the listening area to eliminate turbulence and distortion for louder, deeper, more musical bass and a more open and transparent midrange. When paired with the ES20’s beefy 6.5” woofers, that means the effortless bass you can feel. 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 ES20’s Dynamically Balanced acoustic array with phase-optimized, precision crossovers. From Vintage Hi-Fi to Dolby Atmos & DTS:X ES20 delivers spacious, clear, enveloping, and realistic sound reproduction from nearly any amplifier or receiver—whether 4- or 8-ohm, vintage audiophile, or the latest Dolby Atmos or DTS:X surround sound AVRs.