The Pioneer S-ES21-CR-K consists of two surround speakers and a central speaker. The satellite speakers can be mounted on the wall. Together with the central speaker, you'll be surrounded by cinema sound. With the Pioneer S-ES21-CR-K, a subwoofer is unnecessary. The 16cm woofers provide a warm and full sound. If you add the Pioneer S-ES21-LR-K to this set, you create a real 5.1 setup, and watching a movie becomes a real pleasure.