Effortless output, shocking bass extension and pitch perfect musicality from one of the most positively reviewed and critically acclaimed subwoofers in history. The SVS SB13-Ultra offers a perfect mix of massive output and low frequency extension with musicality and accuracy, all from a stylish cabinet measuring only 17-inches all around.

Since the 13-Ultra subwoofers were launched, we’ve made huge advancements in our Sledge amplifier technology, which is now available to you! Any 13-Ultra owners who ever wanted an affordable upgrade path to enjoy the amazing performance and control benefits of the acclaimed SVS 4000 Series subwoofers can now take advantage of the SVS 13-Ultra Amplifier Upgrade Kit.