Acoustic Horn Design – The Easy Way (Ath4)

[TNT]

Is there a sound to the WG if one would strike it with something hard? It looks really dead. The look btw - I think is the best looking horn I have seen actually.

//

 

[JSS]

Ok that's good news. 800hz it is...
I'll tweak the design, I still have room for 25mm more length and diameter.
I wish I had your sand horn, this PLA printing is a pain LOL

 

[mabat]

Actually, it's far from dead acoustically and this is somewhat disappointing. It's really hard and maybe brittle in a sense it would break if hit hard - I didn't try.

Maybe this could be improved with a different resin, I have no idea.

 

[JSS]

Did these get shipped Marcel or did you pick it up?
Just wondering how it will hold up getting thrown around by UPS Gorillas.

 

[danibosn]

congratulations mabat
we are eager to see measurements

 

[mabat]

They sent a special van, but if packed properly (perhaps individually) I think it should withstand the Gorillas.

 

[mabat]

Are these horns to become available to DIY'ers Mabat??
If so where do I sign up?!

No further plans at the moment.

 

[TNT]

Thats surprising. Sand and epoxy seem to form a non-resonant compound. There may be some possibility for damping on the backside!? If needed.

//

 

[Ro808]

Ok here's a new measurement, I drilled the throat a bit as it was constricted and sanded it smooth. Set the window to 5msec.

How does it look?
Let me know if there's anything else you want me to measure...

The drilling and sanding has clearly paid off.

 

[Ro808]

Actually, it's far from dead acoustically and this is somewhat disappointing. It's really hard and maybe brittle in a sense it would break if hit hard - I didn't try.

Maybe this could be improved with a different resin, I have no idea.

These bowling balls were (also) made by means of isotropic Engineered Sand Composite (ESC) 3d printing technology.
It's ideal for 3D printing large, functional, and strong objects.

The same material was used for the WE32 clones that I posted last week.

 

[fluid]

just trying to generate a horn for Faital HF10AK (Exit-Angel 21° concical, so set "Throat.Angle = 10.5" right?).

No it should be 21 degrees.

Can anyone help me to get an config file with lower vertical coverage.

These parameters will help to set the relative size of the horizontal and vertical but depending on the supershape it may be difficult to get what you want.

GCurve.AspectRatio = (I think over 1.0 sets the height lower than the width but it could be the other way around I can't remember)

Morph width and height

The other option is to use a different guiding curve for the height that is narrower in pattern than the width. It was discussed in this post forwards

Acoustic Horn Design – The Easy Way (Ath4)

 

[Patrick Bateman]

Iwata 300 print TPU65D - low resonance low decay, low weight, 16mm wall.

For some reason, I always imagined you were in your 60s lol

I have no idea why

 

[mabat]

No it should be 21 degrees.

Are you sure? The below is how angles in Ath are specified. Then it depends on what Faital uses and I think they state the whole included angle, i.e. twice what Ath expects.

 

[fluid]

That is the way that I thought Ath dealt with it and I thought the Faital spec was the half angle rather than the full angle, but I could well be wrong about that. I have a conical exit Faital CD so I will have to check unless someone else knows for sure.

 

[mabat]

They state 31deg for HF108 and it's definitely not 62deg included, so that must be the whole angle.

 

[mabat]

The drilling and sanding has clearly paid off.

Are you serious? The only difference is due to the usage of the time window (probably very short).

 

[fluid]

They state 31deg for HF108 and it's definitely not 62deg included, so that must be the whole angle.

Just checked my 146R and I would have to agree that the 29 degrees they state for that would have to be halved to work with Ath, sorry for any confusion

 

[mabat]

As for the highly non-symmetrical coverages (very narrow vertical, for example), honestly I'm not sure Ath is suitable for that at the current implementation. At least I wouldn't expect great results. It's hard to get this to work as intended and it probably requires quite a different type of device.

 

[jzagaja]

Actually, it's far from dead acoustically and this is somewhat disappointing. It's really hard and maybe brittle in a sense it would break if hit hard - I didn't try.

Maybe this could be improved with a different resin, I have no idea.

Try TPU - it's very dead.

 

[JSS]

I have not used TPU. Is it better at not splitting? I found that when I bolted down my PLA half prints it split.

I was thinking of trying the flexible type, not sure if it's a good idea?