Polk Audio AM4055-C SurroundBar Speaker (Black) Single magnetically shielded surround bar speaker with neodymium motor structures for safe placement on or near TVs Equipped with seven 3.5-inch composite cone drivers Patented combination of signal processing and acoustical geometry produces room-filling effects Equipped with three 0.75-inch silk/polymer composite dome tweeters Polk Audio's patented SDS Surround Technology delivers a vivid sound field from a single 42-inch cabinet