wiring two 2 ohm dvc and two 4 ohm dvc

Yes, you can wire for a 1.33 ohm load, but two of the woofers will receive twice the power as the other two. Manage your inventory a little better so that you end up with four subs identical. See woofer wiring (to the left) for help. 4 DVC 2 ohm subs will yield 1 ohm; 4 DVC 4 ohm subs will yield 2 ohms...take your pick, and trade out what isn't working for you. Just in the event, for some reason, you don't care if two subs get twice the power as the other two, the wiring is as: ...well, let the forum know your decision first. As far as needing more power goes, look into buying a high output alternator. With that you will also want to buy a new battery (because if you're like most people you need a new battery in your car anyway). (hint: when you say "gain is only halfway", everybody knows that you aren't sure of how to set it.)Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.