So I just bought the Beyerdynamic 990 DT Pro because people love them and from what I've listened to so far over the past 30 minutes they sound great.
However, I've found that without making any changes to my audio interface they're about half the volume of the IEMs I have been using (Linsoul Simgot EA500) which I honestly found to be pretty fantastic too.
Can't get a fucking answer out of Google of course because its AI generated nonsense telling me to clean debris out of my fucking ports. I'm half deaf so I need to get as much volume as I can out of them. It feels like when I had my Simgots at 30 out of 100 max volume the Beyers need around 80/100 instead so it feels drastic.