I suspect it is indeed different with the F's. I tried them without the stands and found that unique spatiality to be a bit diminished. Seated on the couch or walking around... I find this height to be perfect for my ears and these drivers. Hope these links to Photobucket work. You'll need to cut and paste but the stands are in the first photo (before I added the concrete pads)
http://i1203.photobucket.com/albums/bb394/phaelon56/Audio%20Gear/IM
G_0249-001.jpg
http://i1203.photobucket.com/albums/bb394/phaelon56/Audio%20Gear/IMG_0236.jpg
http://i1203.photobucket.com/albums/bb394/phaelon56/Audio%20Gear/IM
G_0249-001.jpg
http://i1203.photobucket.com/albums/bb394/phaelon56/Audio%20Gear/IMG_0236.jpg