I would love to see a blind test done on those that claimed to be able to discern a bump, dip or none in a filter of that order.
For information, I have the clear and tried abx tests (foobar) with and without the EQ suggested by Amir (except for the bass EQ which was always on). I failed the test. Note that my hearing test show nominal results for a 30 years old person BUT I am not a trained listener like amir and others.
Without evidence, I believe there is a bias when pretending that small dip EQ can litterally transform a headphone from bad to good.
Remember Nasreddin story
:
"Why are you salting the sidewalk, Hodja?" — he demanded.
"To keep tigers away." — responded Nasreddin Hodja.
"Are you kidding, Hodja? Nobody has seen a tiger in these parts on anyone's memory."
"See, Madjid" — answered Hodja, raising his finger — "salt works!"