I've been out of the loop on car audio for many years. I know enough to install a deck and that's it. My new 99 Rodeo came with a sub-woofer and what appears to be amp power wires running to the back but no amp. Is the amp what drives the sub-woofer? If I wanted to make the sub work, what do I need for an amp? I don't want heart-stopping booming, just enough bass to sound good, not rattle the windows in the neighborhood. I'm thinking some kind of small-ish amp would do the trick with some sort of low-pass filter.