I found this great test and scored pathetically on it with 3/3 (Creative AE5 (direct HP) + AKG K550 mk3s)
https://www.npr.org/sections/therecord/2015/06/02/411473508/how-well-can-you-hear-audio-quality
And my ears are apparently pretty decent and sharp, I alwaysheard read there is a pretty big difference between 320kbps mps and flacs but maybe my ears are deceiving me.
Anyhow try the test and maybe be surprised, just don't throw your £600 headphone amp against the wall
https://www.npr.org/sections/therecord/2015/06/02/411473508/how-well-can-you-hear-audio-quality
And my ears are apparently pretty decent and sharp, I always
Anyhow try the test and maybe be surprised, just don't throw your £600 headphone amp against the wall