I have DT990 Pro 250ohm, and an asrock mobo, with ALC1150 for the rear ports, and a NE5532 amp for the front port. I've been using that combo for couple of years now.
When using the front NE5532 port, I usually keep the volume around 15-20%, and at around 30% it start to be too loud. For example The Dave Brubeck Quartet - Take Five https://www.youtube.com/watch?v=pcE-m7ntESQ sounds good and detailed. When there is no sound playing, there is no background hissing sounds. I also now tested the rear ALC1150 port, and had to turn the volume up to around 45% and that was pretty much the only difference.
When I bought these headphones, I also bought a headphone usb amp (can't remember the model, was around 80-100 euros). After couple of days I returned it, because not I or any of my friends could hear any difference between the external amp or the front port. I have also used these headphones with couple different laptops, and there was plenty of volume, but I can no longer remember how good the sound was.
When using the front NE5532 port, I usually keep the volume around 15-20%, and at around 30% it start to be too loud. For example The Dave Brubeck Quartet - Take Five https://www.youtube.com/watch?v=pcE-m7ntESQ sounds good and detailed. When there is no sound playing, there is no background hissing sounds. I also now tested the rear ALC1150 port, and had to turn the volume up to around 45% and that was pretty much the only difference.
When I bought these headphones, I also bought a headphone usb amp (can't remember the model, was around 80-100 euros). After couple of days I returned it, because not I or any of my friends could hear any difference between the external amp or the front port. I have also used these headphones with couple different laptops, and there was plenty of volume, but I can no longer remember how good the sound was.