Acoustic Horn Design – The Easy Way (Ath4)

[Ro808]

My CNC is ready to make these for real (for my Axi2050s) - I've made similar before but with a profile I just guessed. Would you be happy to share the curve? I'm planning to make the first 100mm in one throat-piece and morph to solid wood petals for the rest. I'll share measurements.

That's (gonna be) a biggie
Are the petals made of solid wood?

Do you have measurements of the Axi2050 with this horn?
I suppose you're using the Axi2050 in a 2-way setup?

 

[maravedis]

That's (gonna be) a biggie
Are the petals made of solid wood?

yes, birch ply

Do you have measurements of the Axi2050 with this horn?

It's equalized quite flat from 600hz up but I don't have polars. That's my next project - polars taken outside with a turntable.

I suppose you're using the Axi2050 in a 2-way setup?

yes, with in wall subs.

 

[Ro808]

So these are all basically exponential horns with different mouth terminations, right. The same soup with different names

Salmon soup.
A little background info from time to time doesn't hurt, right?
(honestly, at first I typed "doesn't horn, right?")

 

[TNT]

The background master

//

 

[Ro808]

yes, birch ply

It's equalized quite flat from 600hz up but I don't have polars. That's my next project - polars taken outside with a turntable.

yes, with in wall subs.

Nice concept!

It's hard to see in the picture, but I'm guessing the woofers in the FLH are either FaitalPro or 18Sound.

How do you like the Axi2050's sound?

 

[maravedis]

They're 18sound 8nmb420 in a 'Paraflex'. Fabulous sounding drivers, powerful and nimble.

Not sure about the Axi yet. Need to find them the best horn...

I'm used to Radian 745neo beryllium - which I love the sound of.

 

[TNT]

It sure shows how nearby diffraction can mess up the polar response.

How about like a small jet engine

 

[mabat]

My CNC is ready to make these for real (for my Axi2050s) - I've made similar before but with a profile I just guessed. Would you be happy to share the curve? I'm planning to make the first 100mm in one throat-piece and morph to solid wood petals for the rest. I'll share measurements.

I have something better in the meantime. I'd be happy to send you the profile if you promised you would consider donating to the project. I simply can't (and don't want to) do it completely for free.

⌀792 x 346 mm

 

[mabat]

How about like a small jet engine

That would work!

 

[maravedis]

I have something better in the meantime. I'd be happy to send you the profile if you promised you would consider donating to the project. I simply can't (and don't want to) do it completely for free.

⌀792 x 346 mm

That's fabulous. Yes, I'd be very happy to donate, I appreciate that this witchcraft is priceless. (I'll PM you about that). As you're at it, could you perhaps include the whole mouth roll back? Maybe the radius could tighten as it rolls round so as to save wood and weight. I can fix that myself in fusion but it would be nice to know what effect it had. Here's a close up of the mouth of another one I made.

 

[Ro808]

Ok, one more OT post with some background info...

The Paraflex became popular during the 1970s and was patented in 1974 by a company called Show Sound (ShowCo. Inc.).
However, the concept is based on the Fletcher bass horn, which was developed in the early 1930's by Edward C. Wente (of WE/Bell Labs), who else?
The mighty 20" Aluminium bass compression driver sprung from the brilliant mind of his buddy A.L. Thuras.

Around 2005, Void Acoustics reintroduced the Paraflex.

Alcons Audio also manufactures 15-inch Faital Pro horn loaded mid-bass Paraflex subs.
The shown stack's horizontal polar is quite impressive.

 

[Ro808]

Man, I love your woodwork!

 

[mabat]

As you're at it, could you perhaps include the whole mouth roll back? Maybe the radius could tighten as it rolls round so as to save wood and weight. I can fix that myself in fusion but it would be nice to know what effect it had.

No problem. I'll post the sims later.

 

[jcarothers]

The subject of donating to the Ath project has come up a few times, but for the life of me I can't find a donate link on your website. Are you allowed to post it here, mabat? I'd love to support the project.

 

[mabat]

You can donate via the link on the download page.

(IBAN:CZ1401000000194381070237 BIC/SWIFT:KOMBCZPPXXX)

 

[mabat]

Ever wondered what happens inside the rollback? See the PDF.

It might be a good idea to fill it with some foam.

 

[diyiggy]

Thnks Mabat for the answer, I have not an single idea fo the data or that huge horn, just knw it's a JMLC profile...

 

[Ro808]

All the data is in the links I posted.

 

[454Casull]

Ever wondered what happens inside the rollback? See the PDF.

It might be a good idea to fill it with some foam.

What if the rollback were covered in foam too?

 

[gedlee]

Really? Well that's a piece of cake in the CircSym mode in ABEC- if you have the possibility to run ABEC or AKABAK, attached is a complete project with a sphere placed on axis.

Unfortunately I don't have that possibility and doubly unfortunate that I am not likely ever to have it. That's just not what I do these days.