DE250 indoor measurements. No gating because it probably doesn't matter because these are just comparisons. But I included the MDAT files if anyone wants to gate them.
DE250: Empty throat
DE250: Peace phase plug 5mm recess
DE250: Peace phase plug no recess
DE250: Rockwool, 15mm deep, loosely packed
DE250: Peace phase plug 5mm recess w/ 5mm Rockwool
One peace plug recessed 5mm from start of waveguide and the second has no recess. See attached images of internal ring with the Peace phase plug.
DE250: Empty throat
DE250: Peace phase plug 5mm recess
DE250: Peace phase plug no recess
DE250: Rockwool, 15mm deep, loosely packed
DE250: Peace phase plug 5mm recess w/ 5mm Rockwool
One peace plug recessed 5mm from start of waveguide and the second has no recess. See attached images of internal ring with the Peace phase plug.
Attachments
Code:
OutputRootDir = "C:\Users\asdasdasd\Desktop\ath"
MeshCmd = "C:\Users\asdasdasd\Desktop\ath\gmsh\gmsh.exe %f -"
GnuplotPath = "C:\Users\asdasdasd\Desktop\ath\gnuplot"Pretty much anything, be it demo files included in the (old) package or snippets from this thread. demo1.cfg for example:
EDIT: Removing the ABECProject output solves the problem, but obviously I then miss the ABEC project
Code:
Throat.Profile = 1
Throat.Diameter = 25.4 ; [mm]
Throat.Angle = 7 ; [deg]
Coverage.Angle = 45 ; [deg]
Length = 94 ; [mm]
Term.s = 0.5
Term.n = 4.0
Term.q = 0.996
; -------------------------------------------------------
Mesh.AngularSegments = 64
Mesh.LengthSegments = 20
Mesh.ThroatResolution = 4.0 ; [mm]
Mesh.InterfaceResolution = 8.0 ; [mm]
Mesh.InterfaceOffset = 5.0 ; [mm]
; -------------------------------------------------------
ABEC.SimType = 1
ABEC.f1 = 1000 ; [Hz]
ABEC.f2 = 10000 ; [Hz]
ABEC.NumFrequencies = 20
ABEC.MeshFrequency = 1000 ; [Hz]
ABEC.Polars:SPL = {
MapAngleRange = 0,90,19
NormAngle = 10 ; [deg]
Distance = 3 ; [m]
Offset = 95 ; [mm]
}
; -------------------------------------------------------
GridExport: = {
ExportSlices=1
ExportProfiles=1
}
Output.SubDir = "demos"
Output.STL = 1
Output.ABECProject = 1
You devised the name 
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6774804
- I only remember it was extremely sensitive and it was difficult to actually improve anything rather than make it worse.
It's still implemented as Tickler = { L= / P= / A= }, see https://www.desmos.com/calculator/ejvbqxc8qr
But only applicable on the waveguide, not the Internal Ring.
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6774804
- I only remember it was extremely sensitive and it was difficult to actually improve anything rather than make it worse.
It's still implemented as Tickler = { L= / P= / A= }, see https://www.desmos.com/calculator/ejvbqxc8qr
But only applicable on the waveguide, not the Internal Ring.
But I think that dividing the duct as CinnamonRolls showed above is a more effective approach. As I understand its function, it basically doesn't let any higher modes to develop inside the duct. And kind of averages the outputs of the phase plug slots inside each of the three angular segments.
Solved without issues on my laptop, after the subdirectory "demos" was created in the output folder defined in the ath config file.
Kind of the the tangerine phase plug of Electro Voice.
In theory it should do little if anything "if" the wavefront is completely axisymmetric because there is no angular velocity to disrupt and so the vanes should not do anything. Perhaps there is far more non-symmetric activity than we assume.