You may find, as THylantyr and I have, that you don't need to adjust very much, or that adjusting to YOUR taste is infinitely better than adjusting to some arbitrary assigned frequency response pattern.

After all, all of us humans have different hearing of frequency response across the board with some dips and rises in our perception of sound, regardless of what is actually being presented by speakers or amplifiers.

Right no I have a sinus infection in one ear and my total awareness of my system is vastly different from when I did not.

Marlboro