Wharfedale WH-2BLK Wide-Dispersion Satellite Speakers, Black (Pair) Pair of bipolar satellite speakers for rendering clear and spacious surround effects in a multichannel listening system Each speaker uses two 1.1-inch dome tweeters and two 4-inch Polypropylene cone woofers with hand-wound voice coils Recommended for use with amplifiers delivering up to 120 watts per channel 4- to 8-ohm impedance, 88 dB sensitivity; 80 to 20,000 Hz frequency response Measures 8.9 x 9.6 x 5 inches (W x H x D)