I got an offer from a friend that i could have an old subwoofer she used before she had a kid, i don't know if she has the cable for it or not, but i was just wondering how hard it would be to hook it up, oh yeah the best part is the car i am putting it in is a 4 door 1989 chevy caprice classic. i already had to put in an after market radio that has out puts for a sub. oh yeah, do i need an amp or not? How does the amp get power? from the car battery, threw the stereo?