Technical Pro 72-BOOK500 Bookshelf Speakers, Black (Discontinued by Manufacturer) 1000-Watts Peak Power, 3-Inch Tweeter/5-Inch Woofer , Impedance: 8 ohms Frequency Response: 45Hz-20KHz, Sensitivity: 96 2dB (1W@1M) Dimensions: 7-Inchw x 12-Inchh x 7.5-Inchd Weight: 8 lbs