At least get a friend to take a picture of your face when you push those things for the first time.
At 25 Hz, you're doing better than the vast majority of cinemas and almost all pro sound systems in existence. Going lower will definitely make a big difference with *some* movies (maybe 1 in 3 action/scifi) and a subtle difference with many of the others. Because of room gain, you don't necessarily need a lot of output at the "tuning frequency" of a horn if it's below ~30 Hz. A lot depends on what the room is doing. Mine ramps up like crazy to 20 Hz. IIRC, I theoretically can do near 130 dB sine waves with my subs and without using a huge amount of power) A pair of MicroWreckers at 20 Hz full tilt probably could destroy my home. I guess you'll find out what you get with them in your room.