Acoustic Horn Design – The Easy Way (Ath4)

[TNT]

OK - if your 1440?

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[mabat]

I don't know such numbers. You would have to try it out.

 

[TNT]

FaitalPRO | HF Drivers | HF1440 (8Ω)

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[danibosn]

if you want to share, how did you correct dip above 15kHz

 

[mabat]

I made it look like it's corrected
- It's not so simple and I wouldn't say it's actually "corrected". Part of it is due to a wider throat angle - the sandhorn is simulated for a driver with 30° exit section (HF108). The other examples were for 0°.

This is the #80 shown earlier, for 0° and 30° throat angles. It's different but not necessarily better. In the end, all above 15 kHz depends on a particular driver very strongly so this is all academic anyway.

 

[danibosn]

OK then, I thought that is same driver different profile, so was curious.

 

[Ro808]

How about some horns with the lm peak below 1000 Hz?

 

[mabat]

A "waterfall" style polar map - is it any good?

 

[mabat]

How about some waveguides with the lm peak below 1000 Hz?

Why?

 

[mabat]

Maybe more like this?

 

[mabat]

Some "old school" OSWGs - these are pretty big, free standing 20 - 24", 1" throat.

 

[Twellmann]

Finallly, I have an automatic optimization framework ready (Ath+ABEC+AutoIt) - with an axisymmetric device I'm able to get to 20 seconds per iteration.

Sample of 100 results: ATH - Advanced Transition Horns - Gallery

(any of them available on request )

Good job!

With the python script I made last year it was around 90 seconds with an i3 cpu, and the computer couldn't be touched while running

 

[mabat]

Fine-tuning of axisymmetric free standing 18" OSSE / 1" throat, 0 deg throat angle.
ATH - Advanced Transition Horns - Gallery

Nr. 9 - 433 x 119 mm
Nr. 28 - 476 x 124 mm

Boring already, isn't it

 

[mabat]

Nr. 9 ...

 

[mabat]

Nr. 28

 

[mabat]

Nr. 28

 

[TNT]

Will you do another sand order eventually do you think?

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[Ro808]

Why?

For the sake of completeness / to compare various profiles?

 

[mabat]

... Do I do this from the same distance as before, which was about 1 meter from throat.

If your waveguide is the one I sent Jacek sometime in March (⌀600 mm), this should be the result. Based on the previous experience this should match the reality quite well. I would be surprised if it didn't.

 

[mabat]

BTW, this is the effect of a measurement distance - the same device observed/"measured" at 0.5, 1, 2 and 4 meters from the throat.

- You don't have to worry too much about the mic distance, at least not in this case.