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My DIY electrostatic headphones - Page 33

post #481 of 1299
Thread Starter 

Hi dude_500,

 

Try it for a few days and let us know if it's really stable enough not to put the sweat screen on.  I always have my conductive side facing inward and a sweat screen to protect it.

 

 

 

Hi ujamerstand,

 

Thanks for the link.  That's interesting information.

post #482 of 1299
Thread Starter 

Hi Khbaur330162,

 

Thanks for the link.  It's really an informative read,  

 

Wachara C.

post #483 of 1299
Quote:
Originally Posted by chinsettawong View Post

Ok, I think that we can now confirm that the sweat screen tames down the bass somewhat.  Perhaps its' time to look into what better material is suit for this purpose.  Stax uses a different material for all it's sweat screens.  The material is really thin and fragile.  It has some wrinkles on the surface.  What it is, even Spritzer doesn't know.  confused_face.gif

 

It's very thin PVC film but I have no idea where to source it.  I use the slightly thicker variant found in grocery bags for dust covers or just very thin mylar with almost no tension applied.  

post #484 of 1299

spritzer: any idea what they used on older earspeakers? (e.g. on SR-3?)

post #485 of 1299
Quote:
Originally Posted by spritzer View Post

It's very thin PVC film but I have no idea where to source it.  I use the slightly thicker variant found in grocery bags for dust covers or just very thin mylar with almost no tension applied.  

Quote:
Originally Posted by AmarokCZ View Post

spritzer: any idea what they used on older earspeakers? (e.g. on SR-3?)

 

 

Picture taken of a Sony ECR-500. There are sweat screens on both sides, they're made of extremely thin ?PET? film at very low tension with millions of crinkles in it, spaced perhaps a cm away from the metal mesh (which is just outside -and I believe in contact with- the stator), and they have roughly the same radiating area as the diaphragm, perhaps slightly larger.

 

Hope this helps.

 

And a beauty shot of the diaphragm just to heat things up a bit. Somebody's gonna make a DIY stat with a scalene pentagonal diaphragm, right...? Riiight?!

 

 

I might take the SR-5 apart for you guys if you're truly interested and there's meritable cause, although I wasn't exactly planning on it for myself.


Edited by khbaur330162 - 8/20/12 at 11:35pm
post #486 of 1299

It looks like everybody wrinkles their sweat screens in retail electrostatic headphones. Maybe the industry experts figured something out?

 

Works great! red before addition, green after

 

 

 

 

Crumpled up some 2 micron mylar, loosely tensioned it (basically just enough to get it to lay flat with maybe a few millimeters of extra displacement) and glued it on. Turns out crumpled mylar is a really awesome material. It stays relatively rigid in space in that it's not flopping around, but if you even exhale on it from a foot away you can see it displacing significantly. So it has structural rigidity, but virtually no net tension across the whole screen.

 

 

    

post #487 of 1299
Thread Starter 
Wow! What a nice accomplishment. I'll have to try that. With you guys shimming in, this thread is becoming more interesting.

Wachara C.
post #488 of 1299

Nice job! One year ago I also used wrinkled film to repair my SR-3 and I also didn't noticed any bass roll-off which is quite something since SR-3 have weak low bass even without dust covers.

post #489 of 1299
Thread Starter 

Hi Dude_500,

 

Can you make another set of the sweat covers and put them at the back side of the drivers?  Let's see if they will make any difference in FR at all?

 

Wachara C.

post #490 of 1299

Also listen to slow sine sweep (~ 20Hz to 200Hz, ~5sec) at high volume. The thing is that I always heard resonances at some frequencies when using creasy film. That's why I'm now using PE film which doesn't resonate and doesn't degrade bass performance too.

post #491 of 1299

I didn't notice any resonances in the sweat screen, but currently my headphones are retired while I develop completely new ones. Some issues came up that I deemed not worth repairing. Done with prototyping, the next edition will look aesthetically good and be made with 100% CNC and laser cut parts to ensure channel matching. Going to make an airbrush mounted above a linear motion table to create perfectly uniform and matched coatings.

 

Will post results here when done in a few weeks.

post #492 of 1299

dude_500, neat work you've done there and looking forward to future developments!

post #493 of 1299

Do any professionally made headphones have the sweat shield directly exposed to the outside, or is there always another mesh?

post #494 of 1299
Thread Starter 

There usually is a mesh protecting the sweat screen.

 

Looking forward to seeing your new design.  Good luck.

 

Wachara C.

post #495 of 1299
Quote:
Originally Posted by chinsettawong View Post

Hi,

 

I've just jointed this site today.  I just want to say hi to everybody and show you my version of electrostatic headphones and amplifier.  I've successfully made the phones and amp for about a year now.  I just love them.

 

0976a515_07042009840-small.jpg

 

246deb6d_ESHeadphoneAmp.jpg

 

More pictures can be seen from my photo album: http://www.head-fi.org/gallery/album/view/id/10437/user_id/154445

 

I hope my work might inspire somebody here.  :)

 

Wachara C.

 

dt880smile.png

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