I currently have 1 15.22 and have been looking to go to a two 15 setup, I have been looking at other options, but I like this sub so much that I figure I might as well stay Treo and see if I can find a 2nd SSi...I need the dvc 2, as I plan to rewire my amp to 2ohm while I upgrade my electrical to run a different amp at .5...thanks