It's extremely close. I had the M2 waveguides for a while and they looked just like that.
The interesting question is if this type of throat allows a wider angle than a standard OS-SE waveguide without sacrificing smoothness or if it's just to make the product look high-tech.
Personally, I enjoyed the wider pattern of the M2 vs typical 90 deg horns. They also had more consistent FR in the listening window than the typical OS and SEOS waveguides I had utilized up to that point. That was probably more a function of the gradual termination of the mouth as you have shown several times.
The interesting question is if this type of throat allows a wider angle than a standard OS-SE waveguide without sacrificing smoothness or if it's just to make the product look high-tech.
Personally, I enjoyed the wider pattern of the M2 vs typical 90 deg horns. They also had more consistent FR in the listening window than the typical OS and SEOS waveguides I had utilized up to that point. That was probably more a function of the gradual termination of the mouth as you have shown several times.
OK, here's my refined model (you need Ath 4.7.1). Anyone can easily adapt it for a different size, throat diameter, etc.
It could be improved further I think.
It could be improved further I think.
Code:
; Ath (4.7.1) - JBL M2 clone
Throat.Diameter = 36
Throat.Profile = 1
Coverage.Angle = 62 - 10*sin(p)^2 - 10*sin(2*(p+pi/4))^4
Slot.Length = 45 - 42*sin(2*p)^4
Length = 150
OS.k = 0.9
Term.s = 0.9
Term.n = 3 + 5*sin(2*p)^2
Term.q = 0.996
Morph.TargetShape = 1
Morph.CornerRadius = 8
; -------------------------------------------------------
Mesh.AngularSegments = 100
Mesh.LengthSegments = 32
Mesh.CornerSegments = 4
Mesh.ThroatResolution = 3
Mesh.MouthResolution = 10
; -------------------------------------------------------
ABEC.SimType = 1
ABEC.f1 = 500 ; [Hz]
ABEC.f2 = 10000 ; [Hz]
ABEC.NumFrequencies = 20
ABEC.MeshFrequency = 1000 ; [Hz]
ABEC.Polars:SPL_H = {
MapAngleRange = 0,90,19
NormAngle = 10
Distance = 3 ; [m]
Offset = 155
}
ABEC.Polars:SPL_V = {
MapAngleRange = 0,90,19
NormAngle = 10
Distance = 3 ; [m]
Inclination = 90
Offset = 155
}
; -------------------------------------------------------
Output.STL = 1
Output.ABECProject = 1Attachments
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I think the definition of a minimum phase has an implicit requirement that measurement destination is immaterial, that minimum phase holds for all destinations.
And yep, the 3D nature sure precludes that.😛
It may be true that an inverse filter can correct anything to one exact point in space...but i've come to doubt that, from measurements that seem to be chaotic (lack coherence) even in the best of measurement conditions.
BEM results for the above model (M2 clone - probably a poor one 😛 )
- (H)orizontal, (V)ertical, (D)iagonal polars + throat impedance. Yeah, it's quite wide in H and V (up to some point).
Now I wonder how does the original looks like. It's also not so deep, IIRC.
- (H)orizontal, (V)ertical, (D)iagonal polars + throat impedance. Yeah, it's quite wide in H and V (up to some point).
Now I wonder how does the original looks like. It's also not so deep, IIRC.
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If anyone else is trying to get this to work, here's what worked for me:
1) I downloaded the new version of ATH (4.7.1)
2) I installed the latest version of GMSH (Using the older version of GMSH didn't appear to be necessary)
3) I installed the latest version of Gnuplot
4) I installed ATH 4.7.0 and I replaced it's binary file with the binary from ATH 4.7.1
5) I modified "ath.cfg" to reflect where GMSH and Gnuplot are installed on my desktop computer
Sure, just install Ath 4.7.0 (as described in the manual) and then simply overwrite the file ath.exe with the 4.7.1 version. I somehow forgot to mention that.
I'm not familiar with the J7.
It's the J1-94 that I've heard, at least on 8 occasions.
A stripped-down version of this concept might work at home. Forget the combiner-throat and the mids (keep a single BMS coaxial) and exchange the 18s for 15s or 12s.
Wrt drivers used, you'll end up with something that comes close to the BD systems, albeit with "synergy magic" and wider mid-high coverage.
Here's a video of the J1.
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Sure, no problem.
- It's not that easy, is it 🙂
- It's not that easy, is it 🙂
Code:
Throat.Diameter = 35
Throat.Profile = 1
Throat.Angle = 8
Coverage.Angle = 45
Slot.Length = 60
Length = 180
OS.k = 1
Term.s = 0.7
Term.n = 5
Term.q = 0.996
Mesh.AngularSegments = 16
Mesh.LengthSegments = 32
ABEC.SimType = 1
ABEC.SimProfile = 0
ABEC.f1 = 200 ; [Hz]
ABEC.f2 = 20000 ; [Hz]
ABEC.NumFrequencies = 40
ABEC.MeshFrequency = 36000 ; [Hz]
ABEC.Polars:SPL = {
MapAngleRange = 0,90,19
NormAngle = 10
Distance = 3 ; [m]
Offset = 185
}
Output.STL = 0
Output.ABECProject = 1Attachments
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The ripples... were to be expected. It "loads" pretty well and directivity is not terrible throughout the mid range.
In practice this would probably sound like a (big) dome tweeter on steroids.
In practice this would probably sound like a (big) dome tweeter on steroids.
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If only you knew 😉
After my studies I started to distance myself from the concept of competition.
In the foreseeable future it will become increasingly clear why.
Some pointers are included here.
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