Experience movies, music, and games in high-resolution, room-filling cinema sound with effortless bass. The powerful ES55 floorstanding speaker from Polk is Hi-Res Audio certified and features an acoustic array with Dynamic Balance, precision crossovers, and Power Port technology for improved bass. The Hi-Res Audio certified Terylen dome tweeter of the ES55 delivers crystal-clear highs (40+ kHz) for high-resolution music from services like Apple Music, Tidal, Amazon Music HD, Qobuz, and Spotify HiFi, as well as the soundtracks of the latest Ultra HD films. Thanks to the Dynamic Balance polypropylene woofers and the cascading 2.5-way crossover array of the Signature Elite ES55, you will experience a seamless, realistic soundstage regardless of your listening position. Polk's patented Power Port design provides greater output and smoother airflow for more power and less distortion compared to speakers with traditional bass reflex ports. Combined with the two 6.5-inch woofers of the ES55, this means effortless bass that resonates in your core. The ES55 floorstanding speaker impresses with clear, room-filling, and realistic sound reproduction for virtually any amplifier or receiver—from classic 4 or 8-ohm audio systems to the latest surround sound AVRs with Dolby Atmos and DTS:X. Total frequency response: 40 Hz → 40,000 Hz, sensitivity (1 watt at 1 meter): 90 dB, crossover frequency: 2,500 Hz, recommended amplifier power per channel: 20 watts → 200 watts, weight: 19.96 kg, height: 105.41 cm, width: 21.6 cm, depth: 31.75 cm.