A review of the SVS PC-Ultra Powered Cylinder 13 Subwoofer has been published. However, it appears that other subwoofer models from SVS, including the 2000 Pro Series, 4000 Series, and 3000 Series, as well as the SB17-Ultra, are also being discussed and compared in various reviews. The focus and specifics of these reviews are unclear, with some outlets mentioning upgrades, performance, and features of different SVS subwoofer models.