Acoustic Horn Design – The Easy Way (Ath4)

[mefistofelez]

Hi Marcel,

Thank you for the reply.

I think there's no reason why you couldn't simply trace the contours of the STLs, as most CAD products probably have an STL import function.

I had never had a good experience with importing *.stl files, although following the help (Solidworks).

My recommendation would be to start with a suitable existing adapter and only modify the mounting, preserving the air path, if possible.

That may be a good option, but this is even more unrealistic, because I would need to be able to edit the imported *.stl file, and as noted above, I had not had much luck with the imports.

Kindest regards,

M

 

[Kevmoso]

Ditto on stl import troubles in Solidworks. I hate stl... Stl is what you send to your printer slicer and not a good format for CAD work in general. A step file is the more widely usable format in my experience.

 

[CinnamonRolls]

Microsoft 3D Builder works well with STL files and for creating simple geometric shapes like adapters.

 

[danibosn]

None of this is conical. The whole adapter, connecting the driver and the main waveguide body (which is a truncated R-OSSE), is in fact a "free hand" curve (a Bezier cubic). That's the convenient way of doing it.

Hi Marcel

would you mind to explain it

 

[mabat]

I meant not to work with the STL any further, but to simply draw a new spline tracing the inner shape of the adapter. Or is even this troublesome? OK, I will add STEP files.

The mounting to waveguide is simply 8xM6 at ⌀102mm.

 

[mabat]

Hi Marcel

would you mind to explain it

You can see the inner shapes of the adapters here: https://at-horns.eu/gen2.html
Those are Bezier splines, simple as that. Of course always optimized via BEM, including the whole waveguide.
There's not a straight cone anywhere (anymore). As a result, the acoustic impedances seem more "polished", probably a good sign.

 

[mabat]

The "ROSSO adapter", right from the printers
(two different printers used, 0.6mm nozzle for the adapter, 0.25mm for the ring) -

I still only need to check it fits as it should, some adjustment still may be needed.

 

[mabat]

BTW, these are not supposed to be glued together. The ring should be inserted into a driver firmly (with a bit of a removable glue?) and then the rest of the adapter tightened to the driver with screws, over the ring (again, with some thin bonding/filling layer between the two).

 

[TNT]

You can see the inner shapes of the adapters here: https://at-horns.eu/gen2.html
Those are Bezier splines, simple as that. Of course always optimized via BEM, including the whole waveguide.
There's not a straight cone anywhere (anymore). As a result, the acoustic impedances seem more "polished", probably a good sign.

So you dont have R-OSSE parameters for ATH A250G2?

//

 

[mabat]

The common part (the main body) in combination with the standard 1.4" adapter make one pure R-OSSE profile - that's also how the basic performance is set. All the other adapters are then created differently - by connecting a spline to the common part, which gives a lot of flexibility. For those, there's no single R-OSSE curve.

 

[danibosn]

Thank you Marcel for answer.
I thought that it is simple as you explained, just wanted to be sure.
I assume that we can make a drawing in ABEC, add it to ATH designed horn and simulate all together.
I never did it before, but remember that you couple of time advise similar.
Am I right?

 

[mabat]

The "ROSSO adapter", right from the printers

...and with the driver:

BTW, the effective throat diameter this way is 26.9 mm.

 

[jzagaja]

Hello happy builders. I'm testing Chinese DSP car amp that has 6 or 8 channels 150W with PEQ/GEQ and crossover/delay - total price shipped 269$ with measurement mic, BT and remote. I took my STH280 monitor and corrected passive crossover. Next I will remove passive and reprogramm again. You can store as many "scenes" (configs) you like. Phone app is nice. Optical input and BT. Thorugh USB you can use autotune but it has only 2 target curves and it doesn't correct as good as manual way.

Black is with HF lift made of 3x GEQ with Q=0.5