Acoustic Horn Design – The Easy Way (Ath4)

[mabat]

I would never bother to point out an inconsistency in other's speech if I understood what they mean.

Please understand that a "horn designed using Ath" is too general term to be used in any technical context, other than simply saying that someone made a horn using my tool. That's why I repeatedly object to using the term "ATH horn" as a technical classification - it makes absolutely no sense, it can be anything, from a piece of beamimg and resonating crap to a state-of-the-art waveguide. Does it then make sense to make an "average" of that?

 

[turk 182]

so at the end of the day is a waveguide better than a horn....???
too many are obsessed with classifications and which is better but until a round table to make a determination of such annoyance will in sue.

 

[mabat]

Waveguide is a horn.

 

[nc535]

edit should have quoted post 7161

I agree, although what a person means can often be deduced by considering context and source.

The problem is there no single term that means what RO808 meant when he used the term you objected to. Its onerous to have to use an entire sentence or paragraph in the absence of such a term. The only way we can have such a term is to define one and agree on its use. We can even use that once meaningless term for this purpose once we agree on its meaning.

 

[turk 182]

i whole heartedly agree....so why do we use the term waveguide....oh wait someone thought that using a new term could remove the notion that horn honk/distortion does exist....

 

[TNT]

I think I got it anyway... its a horn/wg that was made using ATH4. An ATH4 WG...

Whats the big deal... Relax - take a beer...

//

 

[mabat]

so why do we use the term waveguide....

I told you already, look that up.

 

[mabat]

BTW, a good horn doesn't have any honk.

 

[turk 182]

agreed!

 

[AllenB]

i whole heartedly agree....so why do we use the term waveguide....oh wait someone thought that using a new term could remove the notion that horn honk/distortion does exist....

This matter has been well defined in the past on this site, some of it before your time here. Nevertheless, why not start your own thread. This thread is not the place for it, if you use ATH4 it's for a reason.

I don't want to have to research all the different ways you've turned this topic into an opportunity for combative posting in the past, but if you continue to disrupt this thread for any reason there may be consequences.

 

[Mazza]

@mabat,
when I read Ro808's comment about the average ATH horn (or whatever he/she said precisely) I read it as a compliment to (you) your software.

To me it implied that you've created a tool that:

• 
  anyone can use for free;

• 
  that allows us to make a bespoke horn/WG (whatever!) to our hearts content;

• 
  with possibly better performance that was ever previously available for purchase, at any price; and

• 
  that the standard of these "on average" is without peer before you made your tool available to us.

High praise indeed then.

 

[dspverden]

Hi mabat,

I am playing with your great tool a bit and still learning, how it works.
I have a question: I have some difficulties with building the waveguide you showed in #941 with the current version of ath. I am sure that I did something wrong.
Would it possible that you publish the script for the current ath version?

Raphael

 

[soongsc]

BTW, a good horn doesn't have any honk.

Honk seems to caused by distinct frequency resonance caused by reflection HOMs or whatever. Usually identifiable looking at CSD and Wavelet plots.
Based on Newell & Holland’s book, horn depth greater than 30cm starts to have honk. I am wondering whether this can be ovecome or not?

 

[mabat]

I still can't see what it has to do with size.

 

[mabat]

...
Would it possible that you publish the script for the current ath version?

I'll look at that.

 

[danibosn]

now you accept "ath version"

 

[TNT]

...because he means a software version of ATH4?

//

 

[mabat]

now you accept "ath version"

Because it makes perfect sense this time

 

[gedlee]

I still can't see what it has to do with size.

Agreed

 

[mabat]

Would it possible that you publish the script for the current ath version?

Try this. It's really a very basic shape (not bad at all).

; Waveguide from post #941 adopted for Ath 4.7

Throat.Profile = 1          ; OSSE
Throat.Diameter = 33        ; [mm]
Throat.Angle = 0            ; [deg]
Length = 114                ; [mm]

GCurve.Type = 1             ; superellipse
GCurve.AspectRatio = 0.952
GCurve.Width = 130          ; [mm]
GCurve.Dist = 0.5

Term.s = 0.7
Term.n = 4.0 
Term.q = 0.995

Morph.TargetShape = 1       ; rounded rectangle
Morph.FixedPart = 0.0
Morph.Rate = 3.0
Morph.CornerRadius = 35     ; [mm]

Mesh.AngularSegments = 100
Mesh.LengthSegments = 24
Mesh.CornerSegments = 8

Mesh.ThroatResolution = 4.0      ; [mm]
Mesh.InterfaceResolution = 9.0   ; [mm]
Mesh.InterfaceOffset = 0.0       ; [mm]

ABEC.SimType = 1            ; IB
ABEC.f1 = 800               ; [Hz]
ABEC.f2 = 12000             ; [Hz]
ABEC.NumFrequencies = 24
ABEC.MeshFrequency = 1000   ; [Hz]

ABEC.Polars:SPL_H = {
  MapAngleRange = 0,90,19
  NormAngle = 10            ; [deg]
  Distance = 2.5            ; [m]
  Offset = 115              ; [mm]
}

ABEC.Polars:SPL_V = {
  MapAngleRange = 0,90,19
  NormAngle = 10            ; [deg]
  Distance = 2.5            ; [m]
  Offset = 115              ; [mm]
  Inclination = 90          ; [deg]
}

Output.STL = 1
Output.ABECProject = 1