Of all the closed headphones I have had the pleasure of listening to. These are THE end game. Ive had to make compromises with the low end or soundstage. These don't sound like they have any of the limits placed on them that MOST closed headphones are forced to endure. I have both the open and these closed here and I am far more impressed with the closed version.
I run them balanced off of either an AUNE X7s or Schiit Jotunheim. Single Ended I can power them off my OppO HA2 for when I travel. They are amazing in their clarity and sub-bass representation. I would use these for professional monitoring as well. They have so little distortion of the true response.
A+ in the headphone world.