Sony SA-W2500 Performance Line 100 Watt Subwoofer (Certified Refurbished) This Certified Refurbished product is factory refurbished, shows limited or no wear, and includes all original accessories plus a 90 day warranty 100-watt amplified subwoofer, 10" mica reinforced woofer Motion Feedback technology Speaker and line-level inputs Frequency response of 28-200Hz