Sony HTD-DW840 Home Theater System (Discontinued by Manufacturer) 100W x 5 Receiver (Black color) Four Front and Surround Satellites with 2-inch x 3-1/2-inch full-range drivers Center speaker with two 2 x 3-1/2 full-range drivers 100W Active Subwoofer - 8 ohms; 20Hz - 20kHz range @ 0.8% THD; 6-1/4 long-throw woofer Stereo Mode - 100W/channel x 2 @ 8 ohms, 40Hz - 20kHz, 0.09% THD