This Polk Audio 5.1 Home Theater Speaker bundle includes:TSi400 4-Way Tower Speaker with Three 5-1/4″ Drivers – Pair (Black) TSi100 2-Way Bookshelf Speaker with 5-1/4″ Driver – Pair (Black) CS10 Center Channel Speaker with Dual 5-1/4″ Drivers – Each (Black) PSW108 10″ Subwoofer (Black) TSi400 Tower SpeakersStep down in size from the TSi flagship TSi500 when you want big impact in a smaller room. Here, three smaller drivers in the classic TSi narrow baffle design make more efficient use of power, while delivering the same wide, realistic soundstage and deep, musical bass response you desire.Features:Unlike other speakers in this price range, TSi enclosures are constructed of extensively braced, solid MDF with 3/4-inch baffles. This virtually eliminates internal resonances and damps energy-stealing vibrations, for more efficient operation and more transparent sound. Polks proprietary, patented Dynamic Balance technology allows the engineers to design out distortion-causing driver and system resonances, so you only hear the good sounds. Klippel motor optimization uses laser measurement technology to ensure a smooth excursion path at either end of the volume spectrum for uniform performance at both low and high volumes. All Polk loudspeakers are timbre-matched within their series, designed with the same components throughout, to achieve seamless speaker-to-speaker blending effects in multi-channel systems. TSi100 Bookshelf SpeakersSmall in size, big in performanThis Polk Audio 5.1 Home Theater Speaker bundle includes: