Hi t-maxxracer
Most of my audio stuff is very high-end but I built my subs, and they sound very good. They are designed to maximise quality not quantity but in you room they will be LOUD. http://www.customanalogue.com/sub_index.htm is the place to start. Read first, and check out competing designs but these sound good to me. Have fun and don't believe anyone else's ears!
you only need the plate amp if you want a seperate amp and seperate sub, the powered sub is all in one and much easier and much cheaper, but if you are a millionaire and want a balls out setup, seperate components are the way to go.
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.