Guess I should have tried the ZMFs on a different amp.
I tried them on the Asgard, and they were fine. Nothing offensive, but also nothing that really grabbed me. I wonder if a different amp might have given them some more life.
The Asgard drove the HE-500s fairly well, so I assumed it'd be alright with the ZMFs. And maybe it was...it's possible the headphones just don't do it for me.
Maybe Joe will bring them back to the next meet so I can have another...