Audyssey update
I have updated my target curve to a straight line with a fixed slope as explained in this graph (Harman curve is the second best in green below):
Then recalculated Audyssey curves for all possible crossovers in REW:
Because target is a fixed slope, the difference (division of target curve to Audyssey curve hence the required editing of the Audyssey curve) resulted in the SAME correction required for all Audyssey curves for all different crossover combinations (highlighted yellow line above).
You can find the coordinates of 35 points correction in the correct format to copy/paste into a javascript editor in the attached .txt file. It works for all crossover points. All you need to do it insert it in the correct speakers' "CustomTargetCurvePoints" in an editor as below:
Finally, this is the end result in MultEQ editor app:
[
"{20, 2.388}",
"{25, 2.159}",
"{31.5, 1.927}",
"{40, 1.685}",
"{50, 1.46}",
"{63, 1.226}",
"{80, 0.985}",
"{100, 0.76}",
"{125, 0.534}",
"{160, 0.285}",
"{200, 0.06}",
"{250, -0.166}",
"{315, -0.399}",
"{400, -0.64}",
"{500, -0.866}",
"{630, -1.099}",
"{800, -1.341}",
"{1000, -1.566}",
"{1250, -1.776}",
"{1600, -1.997}",
"{2000, -2.183}",
"{2500, -2.347}",
"{3150, -2.481}",
"{4000, -2.563}",
"{5000, -2.559}",
"{6300, -2.438}",
"{8000, -2.137}",
"{9000, -1.906}",
"{10000, -1.646}",
"{11200, -1.305}",
"{12500, -0.915}",
"{14000, -0.451}",
"{16000, 0.164}",
"{18000, 0.76}",
"{20000, 1.409}"
]
This method will greatly improve Audyssey calibration however it still lacks correction for boosted HF in Audyssey measurements due to lack of "frequency dependent windowing"!