The line source sound propagation behaves differently than the point source type most everyone has.
I believe that Danny did discuss the nearfield limits a bit during the question and answer as the LS-6's were being developed.
"There is a bass management system built into the LS-6 that will allow some flexibility in tuning the speaker to a particular room. Changing the resistance value can add or take away bottom end centered in the 70 to 100Hz range. This will allow them to be used in a room that might otherwise be overloaded. Still I wouldn't recommend them for small bedroom sized rooms. Recommended listening distance from them is 9 to 10 feet or more. You can get away with an 8 foot distance or less but you are starting to get to far into the near field. "
Also, someone else who had them setup and acheived great performance said this about spacing:
"I've found about 12' is best in my room, which is a bit larger room than Danny's, no comb effects here. I have them about 7' from the back wall and 5' from the side walls. "
For more, try looking back to this thread...
http://www.audiocircle.com/index.php?topic=34105.0Hope that helps