The HDI-4500 is the anchor of a complete HDI Series surround system. This centre channel loudspeaker features a 2½ way design with patented High-Definition Imaging (HD) waveguide technology the patented 2410H-2 1 inch (25mm) compression driver & quadruple 5.25 inch (130mm) Advanced Aluminum Matrix cone woofers for powerful dynamics & incredibly accurate sound reproduction.