audibly transparent dust filter material?

[hellokitty123]

I got some dust electrostatically stuck onto my planar diaphrams and it has caused some resonances that cannot be removed without cleaning.

I am trying to find some material that I can use to cover the diaphram without affecting the sound. I've tried a few foams and synthetic cottons which have audible transparency but they take the edge off of the bass.

Also the synthetic cotton just got micro fibers all over the diaphram adding to the dust issue.

Does anyone know a good material I can use for this purpose?
Appreciated.

 

[rayma]

I think Quad uses Mylar, thinner for the tweeter.

 

[hellokitty123]

Mylar as a dust blocker?
Surely that would block the sound, no?

 

[rayma]

Peter Walker said he found it to be acoustically transparent.
Low mass, about same thickness as the diaphragm (1 mil).

 

[hellokitty123]

Interesting. I'll try that out, thanks 🙂

 

[Mark Tillotson]

So where's all this graphene they kept going on about when you need it?? 🙂

 

[hellokitty123]

I have a block of it actually. A few inches in diameter.
Cost me $400.

Tried to use it as a thermoaucoustic speaker but it lit on fire 😛
Also it didn't sound as good as I was expecting.
The price of knowledge...

 

[rayma]

Interesting. I'll try that out, thanks 🙂

The theory is that the 1 mil dust cover mass is so low that it cannot store energy,
so the sound goes right through. Apparently there can be a LF resonance if not carefully done.

 

[hellokitty123]

The LF is what I'm worried about the most.

Is there some kind of cloth or foam material that would easily work?

 

[rayma]

Doubtful, Peter Wlker would have used it instead. Some more info in these.
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