The Real American HiFi Home Theater Speaker Built to bring the big surround sound theater and music experience into the comfort of your living room, the Polk Signature S30 center 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.