One Subwoofer to Rule Them All. Introducing the PB16-Ultra. An unrelenting passion for breathtaking bass performance and engineering perfection guided every aspect of the PB16-Ultra subwoofer’s development. Groundbreaking technology, rigorous design and extreme testing in real world and laboratory environments allowed SVS to achieve unmatched low frequency extension and output capabilities all while keeping it amazingly detailed and articulate. The culmination of all SVS design advancements, PB16-Ultra represents an incomparable bass experience. Nothing else comes close.