Klipsch R-5502-W II In-Wall Speaker - White (Each) 1 (2.54cm) Titanium diaphragm compression driver mated to pivoting 90 x 90 square Tractrix Horn Dual 5.25 Cerametallic cone woofers Perfect for left, center or right channel use Easily mounts horizontally or vertically Horn-loaded technology increases acoustic output while significantly reducing distortion