Logitech Surround Sound Speakers Z506 (Certified Refurbished) This Certified Refurbished product is factory refurbished, shows limited or no wear, and includes all original accessories plus a 90-day warranty Ported down-firing subwoofer pumps out deep, clean, booming bass Rich 3D stereo in 5.1 surround sound, even from 2-channel stereo sources Multiple inputs make it easy to connect your PC, game console, iPod, DVD player and more 75 watts (RMS) of balanced power and room-filling sound. On-speaker bass control lets you easily dial the bass level up or down