Jude at Head-Fi.org has made two more detailed posts in a thread on Headphone Measurements Discussion. One of the major points that he made in the second post is:
As for measurements you’ll find around the web, I think some of the measurement commonalities you’ll see between different enthusiast measurements on the web is due to commonly shared opinions and recommendations on how to build and tune do-it-yourself measurement rigs.
There is a lot of detail regarding the issues of accurately measuring headphones and IEMs and how that relates to subjective impressions, so the thread as a whole is well-worth reading.
