So I decided to modify the housing of the GMP160. I liked my EQ mod, but it sure would be nice to be able to use these cans for everything without a high powered EQ. You can see the into to this here.
After about a million mods and measurements, I ended up with this:
But it's still not good enough! I think that 8k region needs attenuating. It just doesn't seem to track well with what I hear. More work must be done.