I own them. They have quite a bit of output. An 18x25 room should be no problem. I have them set up in a 17x13 room, but I also listen to them while I work in my office which is approximatly 25 feet from the speakers. I listen at a little bit lower levels than most. I used to have Vandersteen 3's in the same area. The 3's could definitely put out higher sound levels.
