Here's a foam coupler CSD measurement. The foam coupler measurement attempts to isolate the behavior of the driver by taking away some of the influence of internal cavity reflections. There is some belief on my part that our brains might be filter away some of these early reflections - that the behavior of the driver can take precedence over secondary contributions from the pads, internal materials inside the sealed volume (between driver and ear), etc. What I find very interest here is that the foam plate measurement is strikingly similar to the regular solid plate CSD measurement. It would appear that Sony has done a great job of addressing sonic contributions from the pads, etc.