Dave, one always has to remember that frequency does not only depend on equipment, but on room, too. I am not sure I would put D25's into room of this size. While having reasonably decent lows (useful not being in the 20s, but in mid 30s), they could sound boomy in smaller rooms. I had 25s in a much larger room in my previous house (probably 24 by 18) and they were OK, but when I tried them in a smaller roo (similar to yours) the base was very unpleasant.
Good luck.
Good luck.