Built to bring the big surround sound theatre experience into the comfort of your living room, the Polk Signature Series continues in the Polk tradition of American HiFi. Featuring Hi-Res certification, Dynamic Balance driver design, Terylene tweeters, mica-reinforced polypropylene cones, precision crossovers, an anti-diffraction magnetic grille, a non-resonant MDF cabinet, and exclusive Power Port technology, you get elevated sound for movies, TV, and music in a totally re-imagined design. Enjoy rich, clean, full-range sound for movies, TV, and music with Polk's new Dynamic Balance designed acoustic array. It includes a 1 x 1" high-resolution Terylene tweeter for crystal clear high frequency response that perfectly reproduces the latest high-resolution audio files and a 1 x 5.25" low distortion mica-reinforced polypropylene cone for clean, clear bass, better linearity, and increased dynamic mid-range. The exclusive Polk Power Port provides greater, more impactful bass. Overall frequency response is 48Hz-40 kHz, with a sensitivity of 88dB and impedance compatible with 8 ohm outputs. Recommended amplification is 20-100 watts per channel.