I was wondering in the 96 Lexus Sc300, what kind of sub is the middle sub in the back, how many watts, and is this powered by an amp, and if it is what kinda amp is it..Im looking to replace my middle sub with another that is stronger...Im looking to replace it with this 10" Free Air Sub, http://www.crutchfield.com/S-ZSSzvazg3gi/c...00&I=113W2505++ , I'd like to know if this is a good idea, feedback would be greatly appreciated