it's hurting my brain, but i think if you ran 10 dual 1 ohm subs, each ran in series to 2 ohms, with 2 sets of 5 ran in series, and then the two sets of 5 ran in parallel, you'd end up with 2 ohms
wait, that wont work, there aren't dual 1 ohm
so 10 dual 4 ohm subs ran in parallel to 2 ohms, 5 and 5 ran in series, and then the two sets of 5 ran in parallel