Acoustech HT-63 High-Efficiency Horn-Loaded Bookshelf Speaker, High-Gloss Black High-efficiency 2-way bookshelf speaker for home theater systems Dual 6.5-inch graphite-injected cone woofers and 6.5-inch horn tweeter system 60 Hz to 20 kHz frequency response; 96 dB sensitivity and 8-ohm impedance Recommended power handling of 10 to 150 watts; high-gloss black finish Measures 14 by 10 by 7.25 inches (W x H x D); 2-year warranty