Infinity R263 Black (Each) 3-way Tower Speakers Get ready for a sonic revolution. With the 2014 Reference Series, we've drawn upon our legendary past and combined science with art to create speakers that break new barriers. The 1-Inch (25mm) CMMDTM (Ceramic Metal Matrix Diaphragm) tweeter and advanced waveguide provides seamless sonic integration with the CMMDTM midrange. 5.25-Inch (130mm) CMMDTM flat-piston midrange with dedicated sub-enclosure design reduces critical high- and mid-frequency diffraction found in traditional cone-type midrange drivers. Dual 6.5-Inch (165mm) CMMDTM high-output woofers with tuned-port enclosure - Powerful bass is key to a high-quality sound experience and the strength of Infinity's extremely rigid woofer cones - constructed from CMMDTM (Ceramic Metal Matrix Diaphragm) Single Speaker - Sold Individually - Purchase Two for a Pair.