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-   -   Acoustic Horn Design The Easy Way (Ath4) (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4.html)

Boden 12th May 2020 09:47 PM

Although not a compression driver with its associated suspension & pressure issues, Focal succesfully used foam in a single suspension ring in the T120 Tweeter. No aligning/centering problems for the voicecoil assembly to my best of knowledge.

So the picture in post 1997 may at least be worth experimenting with.

mabat 12th May 2020 10:01 PM

Well the picture as shown is really out of scale as the actual suspension would be thiner and wider so the shear resistance may be not so low, perhaps. Anyway, if it could be stiffer than silicone, it could be made of an epoxy resin I know of that can be mixed for being elastic (60 Shore A). That would make quite a good lateral stiffness I guess.

Thanks for the comments. I will think about it. Foam was the first material that came to my mind but it may be difficult to make it in the required thickness.

gedlee 12th May 2020 11:36 PM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6202510.html#post6202510)
Anyway, if it could be stiffer than silicone, it could be made of an epoxy resin I know of that can be mixed for being elastic (60 Shore A). That would make quite a good lateral stiffness I guess.

You can get any shore hardness you want with 2k poly.

The issue is the difference between materials in shear and in compression. With an in-line suspension, the material is always in compression so it works with good lateral stiffness. But any material in shear is far weaker, so using it in shear yields very low lateral stiffness.

What one wants is (very!) high lateral stiffness with low axial stiffness. This is ideally achieved with normal suspensions through the sin(theta) mode of stretching. It is going to be hard to beat this well thought out "classic" approach.

jzagaja 12th May 2020 11:51 PM

1 Attachment(s)
Marcel - maybe you could sim something like we555 but with new hacks.

Ro808 13th May 2020 01:13 AM

7 Attachment(s)
Quote:

Originally Posted by Boden (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6202495.html#post6202495)
Although not a compression driver with its associated suspension & pressure issues, Focal succesfully used foam in a single suspension ring in the T120 Tweeter. No aligning/centering problems for the voicecoil assembly to my best of knowledge.

So the picture in post 1997 may at least be worth experimenting with.

Focal initially used foam and switched to Supronyl for later generations.
In the current M-shaped inverted dome tweeters, a Poron suspension is used.

Both the foam and Supronyl rings are available as replacements parts.

Ro808 13th May 2020 01:21 AM

Quote:

Originally Posted by jzagaja (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6202654.html#post6202654)
Marcel - maybe you could sim something like we555 but with new hacks.

This is a splendid suggestion J.

Perhaps, I should donate a NSD driver then ;)

mabat 13th May 2020 06:16 AM

All right, if you think that a "rubber" ring wouldn't hold the diaphragm properly centered, that would be a major problem. Just by intuition I thought it could be good enough.

Ro808 13th May 2020 06:43 AM

You may want to experiment with Poron Polyuerathane foam(s), the stuff isn't too expensive.

https://parafix.com/wp-content/uploa...th.940.q80.jpg

Ro808 13th May 2020 06:52 AM

Btw, never use alcohol or acetone to "clean" your Nitride coated diaphragm, changes are you'll wipe if off :eek:

Ro808 13th May 2020 07:11 AM

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These companies all buy driver parts from the same Asian company.


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