I have been lurking and pouring over all of the diy subwoofer threads to date for the last week and I am now ready to start putting together materials for my project.(Boy am I glad I found this site I just about bought a fsr18 a week ago!) However, there has been little discussion on amplifiers and where to purchase them. I have seen references to plate amps and websites that sell them but not much on external amps. From what I have learned I will need at least 500w minimum. I realize many of you are asking "what are you driving before I recommend a amp and where to buy it?" The truth is I am not certain if it will be 2 shivas or 2 tc15he. Contemplating damage control, structurally that is!