Depending on the efficiency of your enclosure design, a fair amount of leadway can be given to power your subs. When you get a proper enclosure designed, you will be able to narrow the power requirements down. In my experienced opinion, I would feed no more than 2400-2500 watts to them. I think as you get your design finished, you will be able to feed them much more safely. if you try to feed them 3,000 in a prefab enclosure, you're gonna pop them.