This is wrong. a single 2 ohm sub (SVC) can only ever be 2 ohms. if you have 2 on the other hand, you can do 1 or 4ohms and thats it.
2 DVC 2 ohms subs will be able to wire to .5ohm, 2ohm, and 8ohms. as said above.
i didnt put the .5 ohm cuz you prob wont do that lol. and i didnt put 8 ohms as why would you do that as well