{To get back on track, lets list all known single driver speakers with full/realistic bass (with a somewhat loose definition of "full bass"). }
Listen to some of Bob Brines speakers he's used Lowthers and Fostex, and I thought they were some of the best sounding full range drivers with TRUE Bass for a full range driver, being used in bass reflex and transmission lines. His link is on this board.
I've also heard Fostex FE series in some Tuned quarter wave pipes that sounded pretty damn good.