I bought an old pair of sony speakers. I now realize are more or less useless. $15 what can I expect. But the cabinets are pretty sturdy. I'd like to replace the woofer and tweeter. What are some good not stupidly priced woofers? I also need some suggestion for a tweet, I think it's 3 Inches. and C) what would I need in the way of Xovers etc. keep in mind Im a newb, nothing too technical plz.