I have a pair of D15's on hardwood floors. Floors protected by discs. My speakers are only about a foot and a half from the rear wall and the bass is not boomy at all. When experimenting with placement, the bass only became a bit boomy when the speaker was placed very close to a corner. But I used to have the 2.5 and the D15 is easier to place than that speaker in my room. The bottom firing port really works well.
