Acoustic Horn Design – The Easy Way (Ath4)

[TNT]

I didn't think you "belived" in loading ;-)

//

 

[mabat]

That doesn't mean I can't contribute. Well, it took me an half an hour including taking of pictures, which was the most laborous part
- I mean, if someone wants to try such device, why not at least do it "as best" as possible...

3D overview: https://a360.co/3BR3Wee

 

[fluid]

It only needs a fancy name.

Seems like you gave it one in the image title "OSSLO"

 

[mabat]

No I don't like it.

 

[fluid]

No I don't like it.

Can't win em all

 

[mabat]

I'm considering SATH (Squared Advanced Transition Horn).

BTW, one can easily increase the vertical opening angle and have a really good horn....

 

[tmuikku]

I vote for Bendy Advanced Transition Horn

 

[Kevmoso]

Call it ²ATH and pronounce it SATH?
And the adapter √ATH. Lol

 

[mabat]

I considered ATH² but I'm afraid very few would get it
(And it's a real PITA to type.)

- Finally, some serious debate!

 

[mabat]

Just some pictures - pressure field in a transverse plane near the mouth:
(Frequencies in the upper left corner.)

 

[mabat]

10mm in front of the mouth plane (2dB step) -
(The horn outline is slightly visible behind the color plane.)

 

[mabat]

Nice "ellipses" (100 mm in front of the mouth) - 480 and 860 Hz:

 

[mabat]

Pressure distribution on a sphere around the horn.
Not that it would be particularly useful, I just wanted to see if I can do it

(This is 4.3 kHz)

 

[mabat]

800 Hz, 10k Hz

 

[mabat]

Perhaps it tells some story, after all. This is the frontal hemisphere at four different frequencies.

 

[tmuikku]

Holy pattern flip I've probably asked before but have you tried these bent cheek devices with symmetric narrow nominal pattern, like 50 or 60 degrees or so for both horizontal and vertical axis?

 

[mabat]

That's already quite narrow - difficult to make reasonably controlled.

 

[mabat]

BTW, this is the above horn with 'V' and 'H' made the same (both being 'V' of the above one).

 

[aragorus]

I didn't think you "belived" in loading ;-)

//

Improving the loading does make it easier to cross CD's lower without it becoming overly complicated phase wise.
It also improves distortion in the lower end a bit.
I don't know if this is really a good thing to trade off for constant directivity.
This being said - a fir filter can take care of the phase issue and at low levels the distortion is not a problem.

 

[tmuikku]

^^The images are nice, fun to see how bigger diagonal dimension keeps little bit narrower coverage than relatively smaller dimension vertical and horizontal axis