Good learning experience
3- I used the calculator in VituixCAD to multiply the frequency response of the crossover with the enclosure's (with diffraction). This resulted in a quite big baffle loss :
seemed like you picked up Virtuix cad fast
No need to use calculator
You simply load 0 degree half space response into diffraction tool
And it will do all the calculator work for you. once you click
full space box.
Click directivity and also add vertical info.
Diffraction tool when export is pressed will do the calculator work for you.
Including all horizontal and vertical responses as well in 10 degree increments.
I put red circles highlights in these areas in the photo from your quote above
The other function " feed speaker"
Select what Driver you want to feed this info too
in main project window.
Click export and save to desired file location.
But no need to dig for it and use calculator.
All on axis and off axis info will be automatically loaded
into the driver in the project.
As mentioned do the same for tweeter.
Which is usually the " listening" position.
So you can establish the position off drivers
with XYZ cordinates if you measure them on center.
Or use diffraction tool to export tweeter at its position.
And when doing the woofer. Leave the microphone
at the tweeter position.
Phase info will be correct.
Otherwise if all drivers are done on center in diffraction tool.
You have to set XYZ so position / phase is correct.
Or as mentioned dont move " listening" position
microphone in diffraction tool.
Once you see off axis info on vertical.
It will become important and visible
why driver center to center should be as close
as posible. Basically mount them as close as possible.
Why the Dayton truncated tweeter mounting rings
are helpful. You can mount tweeter very very close
to woofer.
Now you can see why skinny magical baffles aint so magical.
Wider baffle will lower that baffle step your seeing.
And offset the woofer to one side for even flatter response.
Same with tweeter. Offset will be flatter response.