@Andyf1973 , if you are listening to your VO through the Hugo+Euphoria, and it sounds “muddy,” I respectfully suggest that
something is wrong. Have you listened to a few other headphones with the Hugo+Euphoria and thought they sounded great? If so, there may very well be a problem with your VO.
Personally, I had a dac and amp combo that for some reason sounded muddy via the VO, but good with the Auteur Classic. I swapped out the dac and have loved the VO ever since. If you have or can borrow another dac you can test, it would be a worthwhile experiment.
Is there a ZMF dealer in your area? I understand you might hesitate to spend the money to send them back to ZMF for a check up, but it may be the right thing to do. The incredulity people are expressing over the very thought of the VO sounding muddy has veered into the personal, which is unfortunate- but it is based on the VO being such a clear sounding headphone, and your seeming unwillingness to have yours checked out.