Fast, accurate, responsive, deep, and powerful. Great subwoofer. For sale are my pair of SVS SB16-Ultra subwoofers. Fast, accurate, responsive, deep, and powerful. Great subwoofer. The subwoofers are in perfect working condition. I have owned these in my non-smoking home. They are both registered with SVS for warranty and have roughly 3 years left on the 5 year warranty. These also come with the SVS soundpath isolation system feet on each subwoofers.