I ordered subs and long story short they sent me subs that were more powerful than I ordered and so now I need a bigger amp and can not figure out how to get a powerful enough amp at under like $250. I have 2 12" Kicker CRVs. The technical label is 07DCRV124. They are 4 ohm and I believe 400w rms continuous but I keep seeing 800 as well. Can someone tell me the real RMS of these subs and what amp I should use for the 2?