Ultra-Slim 4" tall speaker built to deliver BIG, RELIABLE SURROUND SOUND. Featuring Dynamic Balance acoustic array, with (6) 3" drivers and a 1" Terylene tweeter dome giving you a CINEMATIC EXPERIENCE IN THE COMFORT OF YOUR HOME STRIKINGLY BOLD, DRAMATIC LOOKS and DYNAMIC HEART-THUMPING SOUND — Polk's patented power port technology delivers deeper bass response with its turbulence-smoothing diffuser that minimizes distortion, giving you rich sound for movies, TV and music DESIGNED TO DELIVER – The iconic rounded edges and the detailing are conceptualized from the best acoustic guitars, giving these bookshelf speakers a completely thought-through, performance-oriented stylish look VERSATILE AND PERFECT FOR VARIOUS HOME THEATER SETUP COMBINATIONS – add a center unit to your existing arrangement or create an all-inclusive home theater setup with Signature series for a clear, crisp and room-filling sound. Offering full compatibility with 2.0, 2.1, 3.1, 5.1, 7.1 and 9.1 setups The Signature Series has earned the hi-res certified rating and redefined the REAL AMERICAN HiFi SOUND with Polk's UNWAVERING COMMITMENT, RELIABILITY, AND CRAFTSMANSHIP, making it one of the most trusted names in audio speakers Build an amazing surround system with the signature series collection–s55 tower speakers, s35 center channel, s15 bookshelf speakers and a subwoofer, making your movie nights nothing but perfect