My understanding is that the specific sensitivity and some other measurements are tied to the position of the drivers relative to your ears, and as the SR1A's drivers can pivot freely any FR graph will be a guideline only. Amp power increases exponentially if the drivers are further away from your ears. @RAAL requisite Alex may have a bit more insight to this. Personally, I find that FR graphs are extremely sensitive to tools of measurement, and they don't contain nearly as much information as people often think they do. You get the DBSPL at difference frequencies but the response speed, the actual resolution and a lot of other stuff is pretty difficult to present graphically. That said I would like to see some measurements, if there's a straightforward way of presenting them.