I hope you will enjoy that curious sound!
I have been enjoying mine as I burn them in (with music from my computer to a dac/amp). They have been playing for more than 90 hours now. Monday I will stop the burn in process. That will be 1 week of burning in. Each time that I put them on to check one of the songs that is playing I can't take them off my head either.
I love the sound I am hearing. My experience may be different than some people on this site. For many years I listened to music on nice speakers that were part of a modest hi-fi set up in my living room, with extra speakers in the kitchen. I only used headphones occasionally if I did not want to disturb sleeping children late at night. In the 80s I had Sony v6 but I never liked them. So uncomfortable that I don't even remember if they sounded good. Hated the coiled cord as well. In the 90's I got my beloved Sennheiser HD 480s which I did enjoy listening to late at night. Sadly in 2005 the sound kept cutting out on one side and I stupidly threw them away not knowing the cable could be replaced. When I moved to the UK a year later I left my hi fi system behind. The people who bought my house got a good deal! I even left them the LPs! I still feel sad about the HD480s.
So, back to the Nighthawks. They just sound right to me. I don't know if it because I was used to speakers for so many years. Now everyone is growing up listening to headphones. I still have not taken any of mine out of the house....yet. I use my DAP with portable amp when I relax in the living room. My PC setup includes speakers.
I think over recent months I have finally "learned how " in a sense to listen to headphones... or I should say "listen to music through headphones." For me, the Nighthawks are great at that.