So before I post Abyss measurements, I'm going to tease you guys. My sponge measurement rig is no more. I've built a new one which simplifies workflow (I used to take two measurements, one with sponge and one with a solid-plate.) In other words, all future measurements will not necessarily be comparable to the old ones. I will indicate new measurements with a "V2".
In order to establish a reference, since measurements are still relative and I make no claims of accuracy (other than any subjective references to my reference speaker system), I will provide a few measurements of some other well known headphones first.
