Klipsch Audio RS-62 Black Surround Speaker (Each) Sensitivity - 100db @ 2.83v / 1m High Frequency Drivers - Dual 1 (2.54cm) Titanium Diaphragm Compression Drivers Mated To 90x60 Square Tractrix Horns High Freq Crossover - 2000hz Low Frequency Drivers - Dual 6.5 (16.5cm) Cerametallic Cone Woofers Enclosure Type - Bass-Reflex Via Quad Side-Firing Ports