There is more to this than the sound of the DAP. What about the listener's choice of headphones, iems or bud? What about the quality of the files? What about expectations and state of mind?
Piejesu, have you tried a different filter? Which one is your player set for? I too am curious about what other DAPs you have not found boring.
osterwart, which filter do you use? For my music I use Linear phase slow roll off but I don't actually know the difference between that and Minimum phase roll off. I know that when this belonged to my husband he was using one of the fast ones. Some people change them for different types of music but I can't be bothered.
As for state of mind I am usually just looking forward to enjoying my music ... and so I do. If you , Piejesu, are feeling so negative about this device, maybe nothing will make you happy with it now. I hope that you have music that you enjoy and that you will be able to enjoy it.