Polk Audio RM7302 Center Channel Speaker (Single, Titanium) Single center speaker for use in a Polk RM series surround sound speaker system Dual 4.5-inch polymer cone midrange drivers and 1-inch silk/polymer composite dome tweeter PowerPort bass vent technology improves the lower midrange response for better sat/sub blending Sculpted anodized-aluminum enclosure with titanium finish; 5-way binding post connections Magnetically shielded against video interference; measures 24 x 5.81 x 6.62 inches (W x H x D); 5-year warranty