I don't have time to get into all the details today, but for sake of simplicity, I wanted to show an "average use" case.
Filter set 1.
Dirac 1 position measurement at desktop in my bedroom
Measured at 90dbc to allow 40db over noise floor.
Gain adjust on mic to have 18db headroom.
no clipping found
For this average test case I left the target slope as Dirac and changed nothing.
Here is the acoustic Dirac measurement AND the pure miniDSP output to verify electronic filter assignment.
View attachment 156418
And here is the electronic measurement straight from miniDSP lookback into zoom h6
View attachment 156412
Now, I dislike everything Dirac does BUT in order to compare apples to apples, I quickly recreated the Dirac target curve
And set REW filter design to "max boost" on everything and "1db to target" to duplicate, as close as possible what Dirac does.
I must repeat, I would NEVER set any system up this way.
Here is the filter design and electronic loopback confirmation
View attachment 156413
Loopback
View attachment 156415
So to get REW to do radical things like Dirac always does when running full range I had to set REW to "max all" and "1db to target"
To compare the results side by side I lowered one and raised another to see the different, Here it is
View attachment 156416
The jagged, messed up and non-musical Filter set up top is Dirac.
The smooth, musical, but still not recommended set on bottom is REW
You can argue all you want that the Dirac set makes sense, in my opinion and those of other professionals it doesn't. What Dirac results in is a HUGE loss of headroom and mega distortion when it fills in LF nulls and also unnatural voices trumpets, and cymbals, basically everything above 300hz when it applies narrow boosts that are very audible.
But if you like the top, Dirac filter design than good, after all, it's all about liking what you pay for!