Here is video of my test for EMF emission of Sennheiser CX300II headphones.
They are much better then SONY MDR-E818:
Music in this video is of band Elec3 (Album of 2006 called "Plug & Play") track called "Orchid Extract". It has good dynamic flow of volume and bass, so I picked up this track for the test.
So, as I saw, this model of headphones is relatively good.
This is just small test, that made with Electrosensor device, that is not really created for measuring fields from such small source of radiation. So, this is only indication of what is emitted.
Thanks for looking.