Built to bring the big surround sound theater and music experience into the comfort of your living room, the Polk signature S15 compact bookshelf speaker continues in the Polk tradition of American Hifi. Featuring Hi-Res certification, a New dynamic balance designed acoustic array, precision cross-overs, an anti-diffraction grille, modern cabinet styling and exclusive power port bass enhancing technology, you get elevated sound for movies, TV and music in a totally re-imagined design. Polk-expect great sound.Polk Signature Series HiFi Home Theater SpeakerBuilt to bring the big surround sound theater and music experience into the comfort of your living room, the Polk Signature Series continues in the Polk tradition of American HiFi.A Dynamic Balance designed acoustic array, precision cross-overs, an anti-diffraction magnetic grille, modern cabinet styling and exclusive Power Port bass enhancing technology, you get elevated sound for movies, TV and music in a totally re-imagined design.Polk Audio Signature S15 American HiFi Home Theater Compact Bookshelf SpeakerPolk Dynamic Balance Designed Acoustic ArrayDynamic Balance mica-reinforced polypropylene cones with butyl rubber surrounds, a high-resolution Terylene tweeter, massive ceramic motor structures and high-temperature Conex fiber spiders combine to create drivers with exceptionally high efficiency, clean, clear bass, better linearity, lower distortion and greater durability.High-Resolution Audio PerformanceDeliver clear and detailed high end response for improved vocals in movies and music—plus, a minimum support of 40kHz to perfectly reproduce the latest high resolution audio files with improved audio extension. It’s like you’re right there in the studio or concert hall with the artist, hearing all the music you love in a whole new way.Exclusive Polk Power Port Deep Bass TechnologyPolk’s patented Power Port technology delivers deeper bass response than a traditional back-ported speaker. It smoothly transitions air flow from the speaker into your listening area for deep, extended bass impact while minimizing turbulence and distortion.