granth
+1y
if you want to run your subs on ONE channel, you need dual 2 subs. A pair of dual 2 ohm subs would put you at a final load of either .5 ohm, or 2 ohm. You wont ever get true 2 ohm load power as there are so many factors that go into impedance rise, but that is how you can set it up for running just one channel.
If you want to run separate channels, you will need 2 dual 2's as well. One for each channel. Running one to each channel will give you a 1 ohm or 4 ohm load at each channel.