Pioneer S-HF21 Left and Right 2-Way Bookshelf Loudspeaker System (Discontinued by Manufacturer) Maximum Input Power - 100 Watts / Sensitivity - 80dB (the sound pressure level produced by the speaker) / Frequency Response - 55Hz - 20, 000Hz/ Impedance - 8 Ohms 5-1/8-inch (13cm) Cone Woofer for Dynamic Sound Reproduction / 1-inch (2.5cm) High-Efficiency Semi-Dome Tweeter Magnetically shielded so the magnets will not damage your TV when positioned next to it Dimensions (WxHxD) - 5-7/8 x 10-1/4 x 6-1/4 inches (150 x 260 x 158mm) / Weight (each speaker) - 4 lbs 10 oz / 2.1 kg