Avantgarde dealer disclaimer.....
The minimum room that I would put the Duo Omega is aprox. 14'W X 17'D. I have already had them in a 12' W X 15' D and they sounded very intimate, but a little more space is nice. You can literally put them back against the wall if you want, but they sound better a few feet off the back wall, although it really is personal preference. With the subs having freq. and volume control capability you can dial the bass in, which is really nice. I would not want the speakers closer than 7's from each other, although again, this ends up being personal preference.