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My DIY electrostatic headphones - Page 34

post #496 of 1544

Finally, it's finnished. wink.gif

 

 

 

 

Now just hours and hours of listening... o2smile.gif

post #497 of 1544
Thread Starter 
Those look super lovely. I really like your ear pads too. Do you make them yourselves? smily_headphones1.gif
Edited by chinsettawong - 8/25/12 at 8:41am
post #498 of 1544

Edit: Holy schinkes, I'm a page behind. Those are beautiful Amarok. Intense.

 

 

Sweat screen from an AT-707. To my understanding these are similar to AT-705, PWB electrets, SR30/40/50/etc. and I'm sure others.

 

Front grill of AT-707

 

 

The Sony ECR-500 and Stax SR-5 have sweat screens protected by a plastic mesh, but no fabric that I remember seeing. The more acoustically invisible the protective mesh is the more it will allow dust and dirt in hence the dust covers you see on the 707's, I'd assume.


Edited by khbaur330162 - 8/25/12 at 8:51am
post #499 of 1544

To give some perspective on that picture khbaur posted above here are Stax SR-40 and SR-50 electret drivers ( same driver as AT shown above ) that do not have the silver crinkled moisture guard in place.

 There is a transparent dustguard on these a thin transparent rubbery thing under enough tension it is hard to notice( can't see it in the pictures at all ) just above where the stator dips down on the driver side of that spacer ring. I measured the spacer ring seen just after the housing lip there and it seems to be no more than 1 mm thick. So the silver thing there is instead of one of these transparent things possibly or on the very top of one if you compare pictures.

 

Hope that shows some distances and roughly how the Stax/Audio Technica electrets are constructed. The diameter is ~57mm so how that moisture guard spacing varies with bigger driver size who knows.

 


Edited by nick n - 8/26/12 at 1:52am
post #500 of 1544
Thread Starter 

Thanks guys for sharing your photos.  L3000.gif

 

Wachara C.

post #501 of 1544

More pic's of Stax SR-40

post #502 of 1544

Cool photos Congo!

 

While skimming the old ECR-500 Impressions thread I re-stumbled over this post of ericj's. Gives meaning to the wire mesh outside the ECR-500 stators.

http://www.head-fi.org/t/183017/sony-ecr-500-impressions/45#post_3347954

 

No idea if any of this interests you guys, but it seems like it could be incorporated into your designs. For planar magnetic drivers, use flux plates whenever possible. Could the same be said for electrostatic drivers and electrostatic shielding? I've never heard of an electrostatic loudspeaker manufacturer using this technique, although I admit I'm not that informed.


Edited by khbaur330162 - 8/28/12 at 2:29am
post #503 of 1544

Interesting, but if I understand it correctly this wire-mesh is useless for electrostatic drivers with non-electret diaphragms, am I right?

post #504 of 1544
Thread Starter 
I really don't see how a wire-mesh can help to keep the charge on either electrostatic or electrate diaphragms.

Wachara C.
post #505 of 1544
Thread Starter 

Purrin was so kind to help me make a FR measurements on my Omega clone headphones that I sent to Frank Cooter.

 

 

 

The sweat protection on this one is damping the lower bass somewhat.  

 

Wachara C.

 

P.S. I think the roll off isn't that bad.  It's only about -5 dB from 50hZ.


Edited by chinsettawong - 8/28/12 at 11:50pm
post #506 of 1544

Looks pretty nice, did he make THD graphs or anything?  

post #507 of 1544
Thread Starter 

He also makes a CSD measurement as below.

 

 

 

 

Actually, I've found the FR measurement to be very similar with that of SR Omega that Purrin measured

 

Wachara C.

post #508 of 1544

That's a terrific FR response. CSD curves are remarkably similar to the 007s as well. Congratulations!

 

Did he happen to take distortion measurements for the headphones as well?

post #509 of 1544
Thread Starter 
Purrin said that he would run a few more measurements for me including the THD. Let's wait and see.

Thanks Purrin!

Wachara C.
post #510 of 1544

Here's something to compare to:

 

 

First one is CSD (different time and amplitude scale than the one above!), second is burst decay, third is distortion in % (more like distortion of my crappy microphone biggrin.gif ) And the last one is frequency response of left and right channel with new earpads.

 

And a last thing (interesting maybe only for arnaud), I decided to use just calculator instead ANSYS due to "time deficiency". rolleyes.gif

My calculator results are: peaks at 4.8 + 2.4kHz, dips at following frequencies: 13.1kHz, 2.7kHz, 6.5kHz, 10.6kHz and 1.7kHz.

Except the 2.4kHz and 1.7kHz all frequencies are correct and I think that's nice result.

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