Acoustic Horn Design – The Easy Way (Ath4)

[Ro808]

Very interesting!

Suggestion: try to morph the throat into an ellipse which opens into an rectangular mouth.

 

[mabat]

I've already simulated some. So far nothing worth talking about, really.

 

[Ro808]

It seems you've pretty much cloned the throat of the 18Sound XR-series.

 

[mabat]

It's hard to say if it has any real merit -

 

[Ro808]

Is this with 1 or 1.4" exit?

 

[Ro808]

It may be worthwhile to experiment with the 'slot' length, height and width.

 

[mabat]

I don't know, I haven't found it doing anything really useful. The above was 1,4". I have seen better without narrowing the throat.

I even tried to incorporate it in some of my better designs - it was always worse.

 

[ErnieM]

Maybe make a waveguide for the Bliesma T34B with control down to 1khz....would be a very low compromise treble solution for home use.

 

[mabat]

Yeah, I thought about that several times. Maybe even because the diaphragm is so rigid the simulation could represent the reality pretty well to a relatively high frequency.

Does anyone have the dimensions (a drawing) of the external moving parts of the tweeter? I could try something...

 

[Ro808]

Maybe make a waveguide for the Bliesma T34B with control down to 1khz....would be a very low compromise treble solution for home use.

WGs for the Bliesma tweeter(s) are also being developed in this thread.

 

[Ro808]

I don't know, I haven't found it doing anything really useful. The above was 1,4". I have seen better without narrowing the throat.

I even tried to incorporate it in some of my better designs - it was always worse.

I expected some improvement wrt pattern control in the vertical plane. Your waveguide appears to be 60x60°, so it's hard to tell if this is the case.
Anyway, it's probably not worth further exploration.

 

[mabat]

Vertical? I'd expect horizontal, and maybe it is, up to a point, but it doesn't come without drawbacks. What I showed is about 90x80°.

My focus now will be the phase plug.

 

[mabat]

WGs for the Bliesma tweeter(s) are also being developed in this thread.

I think something bigger would be anticipated. I'm all for it, I'd only need a drawing of the tweeter without the grille. It would be nice if the grille was made optionally removable (held in place magnetically), like e.g. on Peerless DA32TX00-08, which could also work pretty well for the money - I have a pair of those (not so the Bliesmas) and may try something with them as well. These are waveguide-ready, so to speak.

 

[jcga]

Does anyone have the dimensions (a drawing) of the external moving parts of the tweeter? I could try something...

Hello,
M. Stanislav Malikov, the owner of Bliesma is very open minded and I suggest to get in touch with him directly. see the following link:

http://www.bliesma.de/contact.html

I would really like to have some waveguides for the T34B or the smaller T25B !

I currently use a T25B on a renovated "Boule Elipson BS40" from the sixties and I like what I hear...

Jean Claude

 

[Ro808]

Vertical? I'd expect horizontal, and maybe it is, up to a point, but it doesn't come without drawbacks. What I showed is about 90x80°.

My focus now will be the phase plug.

90x80° is almost symmetrical, but at least there seems to be no pattern flip.
You polars are somewhat better than those of 18Sound.

 

[mabat]

Implemented an algorithm for smooth rolling back of an arbitrary profile -

 

[mabat]

Just don't ask me what spiral it is - I have no clue. Probably some generalized clothoid.

 

[jzagaja]

possible to add variable thickness for printing?

 

[diyiggy]

I think something bigger would be anticipated. I'm all for it, I'd only need a drawing of the tweeter without the grille. It would be nice if the grille was made optionally removable (held in place magnetically), like e.g. on Peerless DA32TX00-08, which could also work pretty well for the money - I have a pair of those (not so the Bliesmas) and may try something with them as well. These are waveguide-ready, so to speak.

The grille of the Peereless is also for the radiation patern and not only protection if I remember !



If 1200 hz is possible w/o horn, how low do you expect it to go horned ?


Btw , have you purchased drivers on Sound Imports ? No problems ?

 

[TNT]

Never wrong with GR ;-)

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