The Polk audio R400. is a compact just 19 inches wide center channel speaker, because of its size it fits into any home theatre quite beautifully. It is a powerful and unrivaled speaker with excellent sound quality. It comes along with an additional two turbine woofers shaped like a cone. The speaker has all of the latest technology patented by Polk audio including its unique X port technology that allows the speaker to offer enormous at the same time balanced audio and sound quality. Audio reserve-400 high-resolution sound quality.