Since I had to replace my broken door speakers I'm now eyeballing those two alpine speakers that are next to eachother in the trunk. Are those suppose to be some sort of woofers? Their magnets are way bigger than the door speakers. What wattage goes to those speakers? Should I replace them with 6.5 inch woofers or could I get a very small box with a 10' sub? I don't feel like running any amps. I just want something slightly nicer.