Acoustic Horn Design – The Easy Way (Ath4)

[mabat]

There's no need for that as these are just for the calculation of the total radiated power, the positions are not important (so long as there's enough of them).

 

[mabat]

No yet a full 3D report but in separate planes -
1.5" throat R-OSSE/KVAR (18sound ND4015Ti2 in mind), 480 x 268 mm, data calculated from the front hemisphere only.

 

[mabat]

Again, now DIs for the full sphere, i.e. the actual values:

 

[mabat]

Returning back to #9981 (which is the big horn in the making), the throat impedance can be further increased on the lower end without a noticeable degradation in polar response by adding a variable slot -

I'm not sure it is worth it, just that it's possible.

 

[wesayso]

I wonder what would happen if you'd add this kind of throat :

 

[mabat]

Now I'm testing a general 2-profile geometry, consisting of a throat adapter and variable number of succesive segments, each segment being two independent (H/V) OSSE profiles (here all flat which is just a special case). As there's an obvious practical appeal in the flat panel construcion, I hope this way we can get the best out of it

 

[tmuikku]

Super cool! Thanks!

 

[kipman725]

Great development, for those making big horns.

 

[pelanj]

Now if rectangular throat option was added, it would be perfect

 

[mabat]

"2-profile geometry" means that it can be made of two bended sheets (aside the throat adapter that can be 3D printed or milled):

(This was an infinite baffle simulation.)

- Now I'm really curious if someone comes up with something even remotely usable

 

[tmuikku]

I dare you to sim ST260 or ST360 profile! both axis with the same profile.

 

[mabat]

One more in infinite baffle (just testing, 1" throat, 289x152x160 mm) -

 

[Olombo]

Is the round of rectangle transition at the driver causing this peak in V HF section? Besides this that starts looking interesting!

 

[mabat]

ST260B profiles (infinite baffle):

Horizontal/vertical:

Diagonal:

Throat impedance:

Above 10 kHz it's hard to say how much of it is just rubbish. It would need a refined mesh to verify (and much longer computation time).
I have to say I'm surprised by the smoothness.

 

[mabat]

These are the horizontal polars calculated (with the data points) which is simply amazing.

 

[tmuikku]

Truly :O

 

[aragorus]

These are the horizontal polars calculated (with the data points) which is simply amazing.

View attachment 1057494

wow

 

[mabat]

The previous horn with a little bit extended throat adapter (20 mm), 265 x 265 x 119 mm total -

Horizontal:

Diagonal:

Throat impedance:

Note that this is still "only" an infinite baffle, which is only a half of the story...

 

[mabat]

Now if rectangular throat option was added, it would be perfect

Many have called for this, now with the 2-profile geometry it's easily possible -

 

[kipman725]

I'm very excited to use this code to make some horns. Is it possible to generate horn models with throat vanes as some of the TAD horns have?