Could you suggest what to change? I don't know if it is the best possible setting but it sounds right to me. I just followed the fr curve from pdf with suggested mods for the evo. Thank you in advance!

To flatten the sound of hd681 evo I use this eq in equalizer APO:     Frequencies   10   21   42   83  166  333  577  1000  2000  4000  8000  16000   20000  Gain Values   -5   -7   -8  -6.5  -4.5  -3  -2.5  -2.5   -3.5    0  -4.5   -3.5     0