@Olli Yes, I can confirm in Acourate and Audiolense that the simulations match the measured in REW perfectly - done it over a dozen times in both programs and don't even bother any more.
Agree with the downward slope or tilt of 20 Hz to -10 db @ 20 kHz provides the most neutral response in my experiments. And seems to agree with the R&D that Floyd Toole and Sean Olive have performed, which I wrote a summary, peer reviewed by Sean Olive:
The Science of Preferred Frequency Response for Headphones and Loudspeakers.
Here is the measured response of my system at the LP using default REW settings with a 500ms right window:
View attachment 22675
Aside from
constant directivity horn equalization, this was taken before I used partial correction to 8 kHz. For some waveguides and compression driver combos, I find leaving the top octave alone sounds less strident, as does using a very small value (e.g. 1) for HF excess phase correction. Then the HF eq is acting more like a tone control.
Hope you have fun in your new space!