I first found Dynaudio while speaker shopping at a local high end shop. I was so impressed with the sound and really wanted the bigger towers, but I opted for bookshelf Special 40s since my listening room is small (13' x11').
Once I got them home, I loved the sound, but wanted more lower end so I traded them for a used set of Contour 20s. I found the Contours to be the perfect match with enough punch to fill a larger room if necessary. Speakers are 7' apart (3' from back and side walls), and 6.5' each from the seated listening position (almost a triangle). They sit bolted to Dynaudio Contour 20 stands filled with sand. Toe-in is set so tweeters point directly to the listening position, but I have tried them without toe-in and they still sound great.
Since I'm banned from filling our much larger living room with audio equipment, I waited for the opportunity when the wife would be away for a week and relocated the McIntosh/Dynaudio set up into the larger living room; where I also rearranged the furniture to suit audio, not guests. With the extra space the system showed its greater potential, treating the neighbors to a live Led Zeppelin concert. Eventually, I retreated back to my listening room and I'm still very happy with the Contour 20s.