Hey, I have a couple questions about these subwoofers. I was thinking of purchasing this enclosed system on ebay. It says it is prewired to 2 ohm. Does that mean that if I just hook up an amp to the terminal, it will only have 2 ohms of resistance? Or will it have more or less? I am also wondering what amp to buy along with these woofers, preferably something under $250. Thanks for all of your help.