I decided to do one myself... putty around the edge, and I cut up some small thin felt disks and stuck them on the back of the driver. Isolation is much improved, and bass just feels cleaner. I'm liking the sound of these. There's a V shape for sure, a pretty strong warm tilt, good soundstage and "airiness" to the higher end, though I think maybe something funny is happening in the treble because snares/hihats are nice and sharp but feel a little "off" somehow.
Something I just barely noticed; in the hole in the middle of the driver is a piece of foam. You can pull it out to experiment with the sound. I left it in.
Edited by Armaegis - 11/10/11 at 9:11pm