I can see the point that if some portion of the headband like a grommet is soft enough, energy won't get past it to the other side. But if the vibrations don't get past the grommet the energy would still be floating around in the earcup and presumably still messing up the sound in the originating earcup. But at least you wouldn't have crossfeed distortion. Energy does not just die, it transforms into some other form. Sorbothane claims to turn the mechanical energy into heat. I assume that eventually the earcup vibrations turn to heat in the earcups whether sorb is applied or not. Otherwise your earcups would be ringing forever. But the sorb is more effective and does it faster. However, if enough pressure is applied by the pivot to the grommet it might compress it so that it acts more like solid material and passes vibrations anyway. Nevertheless, something like this could be tried and might be effective. I first got on to the damping problem when I realized that the headband of my Stax SR007 was vibrating . http://www.head-fi.org/t/671314/stax-sr007-resonance-problems .I felt that the rather than working on the headband, the better solution was to dampen the earcups so much that there wouldn't be anything to go to the headband. Apparently I have not succeeded and crossfeed is going on even on my heavily damped phones. And that is why I am trying these clips as an experiment to see if compressed sorbothane works better and that seems to be so. This is really a separate issue from the crossfeed reduction. At some point I would hope to find another way of doing this that is less ugly. Anyway I found the discussions of the audioquest and B&W phones interesting inasmuch as they emphasized crossfeed as the source of distortion. Grado doesn't discuss this in their e series but talks about improving transient response. Sennheisser doesn't explain the rational of their damping in the headbands much at all and I see little discussion of this topic in the reader forums. So I don't think we have really figured it out. All I know is that I can generally get much better sound to my phones. using sorbothane damping. Exactly why and what is the best way to do this is still unclear.