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Old 22nd May 2006, 07:26 AM   #1
Rhydon is offline Rhydon  Canada
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Default Soft Dome Tweeter Coatings

Hi all,

Ive become fascinated in the technology that is involved in coating tweeters to help reduce their resonance and/or even their frequency response.

My question is:

I would like to experiment with tweeter doping (i know i know, not too liked around here), in doing so, what are the most recommended doping/soft dome coatings recommended out their? (not too crazy about water soluable materials, i want it to last- ie no mod podge). Eventually i would like to construct my own soft-dome tweeters but i cant seem to find out this type of information anywhere.

In particular, i prefer the Dynaudio soft domes. To me, they have the perfect balance of acoustical characteristics.

So, does anyone know any good doping/coating materials used for the construction of lightweight soft dome tweeters similar to the Dynaudio ESOTAR's?
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Old 22nd May 2006, 12:10 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

Formulation of coatings is kept very hush-hush,
you will not find any information (AFAIK).

Also note most domes are "impregnated" not coated,
the matrix and the coating not being didtinguishable.
Seas Sonolex (used for soft domes) for example
comes in prefabricated sheeting and is not coated.

/Sreten.
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Old 22nd May 2006, 02:45 PM   #3
SY is offline SY  United States
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Sreten is correct, the goopy stuff in the Dynaudio domes is done via impregnation. An external coating will more often degrade things rather than help.

Choosing a coating systematically starts with defining precisely what you want the coating to do. And that will be different from driver to driver; the idea that there is a "universal" coating that will benefit all drivers is nonsense. Commonly believed nonsense, but still nonsense.
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Old 22nd May 2006, 04:32 PM   #4
Rhydon is offline Rhydon  Canada
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Tho i agree, some of the coating is integrated, it certainly isnt all of it. Go to the Dynaudio website, under car audio, there are a number of promotional videos of the in-house driver production (quite low budget, but it still shows the process they go thru). You can see the Dynaudio soft dome tweeters being elivated thru a white liquid, then put on a tray to dry.
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Old 22nd May 2006, 06:58 PM   #5
SY is offline SY  United States
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Ooooooh, they have certainly cheapened the product, while raising prices. I saw their process back in the SENlabs days and it was pretty sophisticated.
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Old 25th October 2016, 03:17 AM   #6
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Apparently, the coatings are used to reduce excess energy at certain frequencies, but not to eliminate "colorations" of certain materials.


It is a myth that the materials of the cones or domes speakers each have a characteristic sound?


According to this article it is false ...


Drivers and the Myth of Tweeter Dome Materials | AxiomAudioBlog



Incidentally, I have written these days several times a support of Audax to orient me about buying a dome spare tweeter TW034X0, (I do not want parts of dubious origin, want legitimate), and I have not received any. It seems that the company has been sold, but new buyers are not doing well ....
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Old 27th October 2016, 12:25 AM   #7
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It's water based, but opanol - that I think is a 50:50 mixture of ethanol and water - provides an outstanding doping compound for cotton midrange domes and therefore likely tweeters also one suspects.

As recently revealed in another thread ("Better dome midrange design than ATC?"), one trick you can employ is to avoid using any dye material to colour the raw resin impregnated cotton domes available for purchase.

I believe this allows a better absorption of the damping compound into the fibres and produces measurably and (to my ears at least) audibly better results. Just they do not look particularly nice (to anyone's eyes I suspect).
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Old 27th October 2016, 07:12 AM   #8
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How can ethanol or water do anything when they evaporate in minutes?
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Old 27th October 2016, 09:04 AM   #9
SY is offline SY  United States
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Quote:
Originally Posted by augerpro View Post
How can ethanol or water do anything when they evaporate in minutes?
Oppanol is polyisobutylene. It comes in a variety of viscosities.
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Old 27th October 2016, 10:26 AM   #10
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Thank you for correcting me The important point is that it works very well indeed
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