DESC: A powerful collection of speakers, the Polk TL250 Blackstone series home theatre system gives you all the major parts you need to get your home audio system off the ground. Four TL2 bookshelf/sattelite speakers surround you with sound, while the TL2 center channel speaker grounds your audio thanks to unique Time Lens technology and a curved enclosure design. Dynamic Balance driver technology finish the sound by helping to flatten the audio, so that the only surprises you get from your music and movies are good ones.