THX Select Model 4400 LR Front Channel Speakers are high-performance 2-way systems intended for use with a quality subwoofer, such as the THX Select Atlantic Technology Model 642e SB. Each 4400 LR contains two proprietary GLH (Graphite Loaded Homopolymer) 5.25" (135mm) midrange woofers, and an audiophile reference 1" (25mm) ferrofluid-cooled, damped silk dome tweeter, with a powerful neodymium magnet structure. The 4400 LR is available in High Gloss Black or Satin Black. The 4400 features a flush rear terminal cup and dual keyholes, for wall-mounting capability.