[khbaur330162]

http://20cheaddatebase.web.fc2.com/SONY/ECR-800.html
 
I thought it was interesting. Maybe you can try to incorporate it, Wachara? Really cool work, btw.

 

[chinsettawong]

Hi Khbaur330162
 
Thanks for your info.
 
One of these days when I have the time and mood, I'm going to make another pair of headphones with all the dimensions similar to HE90. 

  
 

 
Wachara C.

 

[spritzer]

It would be very cool if you could make two versions, one flat like the HE90 and one where the drivers are angled by a few degrees.  I suspect a large reason why the HE90 imaging is so odd is down to this. 

 

[chinsettawong]

That's a good idea, Spritzer. I will try your suggestion the next time I make them.

Wachara C.

 

[dude_500]

Really amazing work. I may have missed it if you already said, but what thickness PCB are you using for the middle spacers?

 

[chinsettawong]

Hi Dude_500,
 
I now use 0.5 mm PCB as spacers.
 
Wachara C.
 
 

 

[chinsettawong]

I just want to post this information here so that some of you that have a similar problem as mine can solve it.
 
My DIY headphones start to develop the weird squeal.  It only happens after I've been listening to them about half an hour or more.  The longer I listen, the more obvious the squeal is.  It's very annoying.  At first I thought that there could be some loose connections or some dust in the drivers.  But on close inspection, I find that it's actually the moisture (humidity) that is the real cause.  
 
My left driver's dust protection diaphragm was accidentally damaged and had a small hole on it.  When wearing the headphones after a period of time, the humidity inside the cup starts to accumulate.  The moisture finds its way into the inside of the driver and eventually condenses into tiny drops of water on the diaphragm causing the electrical leakage from diaphragm to stators.   
 
My solution is to replace the dust protection diaphragm.  On Stax, there are normally two pieces of dust protection diaphragm.  One is in the front and the other one is in the back side.  If the front one has a hole and the back one is still in good shape, you might want to try to swap them.  The dust protection diaphragm isn't that critical on the back.  
 
Wachara C.

 

[Phos]

It's my understanding that Koss's electrostats tend to get that problem after a while.  

 

[chinsettawong]

I'm sure that it's a common problem for all the electrostatic headphones.  Just a small, tiny hole is enough to cause this problem.
 
Wachara C.

 

[HeadphoneAddict]

Quote:

I'm sure that it's a common problem for all the electrostatic headphones.  Just a small, tiny hole is enough to cause this problem.
 
Wachara C.

 
What Phos is trying to say is that the Koss ESP-950 tend to do that more often than other stats, and may not have a hole in the dust cover to cause the problem.  I think my previous pair of HE Audio Jade also developed an issue with noise from high humidity after I sold them to someone in Houston, while they sounded fine in dry Colorado weather.

 

[chinsettawong]

If you are sure that the dust covers on both front and back side are good, then the case of humidity affecting the drivers is extremely small since the covers block out the moisture and dust. So the noise problem should come from either the cable or connections.

Wachara C.

 

[spritzer]

The ESP950 does not have a solid dust cover on the back so dust is the most likely issue. 

 

[hello im sean]

hey im sorry but where is the dust protector? im trying to find it....

 

[chinsettawong]

Quote:

hey im sorry but where is the dust protector? im trying to find it....

Which headphones do you have?  Have you tried taking them apart to look inside?  The dust covers are situated on the very front and very back of the driver.  In Stax SR007 and SR507, the dust covers are exactly the same for both front and back side (I guess they all are the same for other series as well, but I'm not sure).  However, for HE60, they are different, and you can't simply swap the two.  I have no idea what it is like inside Koss 950 though.
 
Wachara C.

 

[hello im sean]

i dont have any electrostatics but id like to make a pair! did you make your own dust cover or use one off of the stax?