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My DIY electrostatic headphones - Page 62

post #916 of 1634
Thank you for the compliments!

Just waiting for the 0.5mm spacer parts now and pretty sure I will have everything ready to put them together though I fly out to sit of a beach in Malta till Friday so maybe next weekend I will get a chance :-)

Koss is an even bigger problem in the the UK! They don't sell the 950 here or parts, no luck with distributer and Koss was $15 for the cable and about $60 for shipping!!!!! Tell you what guys someone in the US should buy a load and sell them on eBay worldwide as a service and to make some good profit....! ;-)

Chaz
post #917 of 1634
Thread Starter 
Today I welcome our head-fi member, Ayaflo, who comes all the way from Bangalore, India to visit me.  I let him listen to my Omega clone and my version of Orpheus.  Playing songs through Macbook and KGSSHV, he likes the Orpheus better.  o2smile.gif




Edited by chinsettawong - 5/10/13 at 10:22pm
post #918 of 1634
Welcome and they look great!

So put together one of the drivers this morning to see how it goes and makes a sound (yay!) but a couple of things I could do with some advice on:

- bass response seems ok but treble is low- need more tension on the diaphragm?
- needs a lot of volume to drive them with from a pro bias Stax SRD-7 - just the config (using Elvamide etc) or again the tension?

Cheers

Chaz
post #919 of 1634
Thread Starter 
Hi Chaz,

I don't really like using Elvamide. Your problem could be too high resistance on the diaphragm and therefore the bias voltage isn't at its optimal. I would keep plugging it in for a while and listen to see if it gets louder.

I would advise you to get some electrostatic gel clenser. It'll make your build a lot easier.

Wachara C.
post #920 of 1634

had a great time mr. Wachara.

 

I am still listening to Skylark now. addicted to that song at the moment. 

 

your collection of music is kinda nice too beerchug.gif... love both the cans they are amazing!, best things I put on my ear - especially the comfort of the orpheus clones were so amazing.

 

thanks!! 

post #921 of 1634
Quote:
Originally Posted by chinsettawong View Post

Hi Chaz,

I don't really like using Elvamide. Your problem could be too high resistance on the diaphragm and therefore the bias voltage isn't at its optimal. I would keep plugging it in for a while and listen to see if it gets louder.

I would advise you to get some electrostatic gel clenser. It'll make your build a lot easier.

Wachara C.

Think you hit the nail on the head, tried graphite (don't have any cleanser gel but will try to get some) and that bought the volume needed right down and seemed to bring out the full range nicely!

Just putting the bits together now but you know how long the sewing bits around the pads takes but will post some pics soon

Cheers again,

Chaz
post #922 of 1634

I got some 0.9 micron mylar last week and finally had time tonight to make some diaphragms out of it. What a profound improvement! Trebles are much more pronounced, although there may be a very slight reduction in bass. I also notice the soundstage moving more forward away from the center of my head, which is awesome. Certain female vocals sound as much as a foot in front of me.

 

I very much still prefer 2um dust/sweat shields than 1um. I think they provide just enough damping to suit my taste.

 

Although the price to pay is that the material is a nightmare to work with. Procedures that work on 2um mylar (which comparatively is as strong as brick) will likely not work on 0.9um. I had to add tape where each tensioning clip goes in order to balance the load to prevent it from immediately sheering the whole sheet of mylar as seen in the following photo. With 2um mylar, I can just clip directly to the film.

 

 

 

I wonder if there are sources of even thinner mylar. I've worked with 0.1um films and they are certainly too fragile for electrostatic headphones, but I imagine something in the range of 0.5 - 0.7um could be made to work with sufficiently well constructed tensioning jigs.


Edited by dude_500 - 5/11/13 at 11:28pm
post #923 of 1634
Thread Starter 
Nice to hear that you like the 0.9 micron Mylar. But you will find out later that this material is too temperature sensitive. I played with it for quite a while but never could get it to be stable enough. The sound from it is amzing though.

Wachara C.
post #924 of 1634




A few work in progress pics, need to make a new headband pad, ear pads and sweat guard and work out a few kinks with the balance of the drivers but initial impressions are good, very deep bass and articulate with reasonably reserved mids. Any fellow builders got any advice on what modifications (tension, coating etc) made to the different properties so I can make some informed experiments?

Also after hearing how loud these little beasts can go I am certainly thinking of electrostatic loudspeakers at some point in the future ;-)
Quote:
Originally Posted by dude_500 View Post

I got some 0.9 micron mylar last week and finally had time tonight to make some diaphragms out of it. What a profound improvement! Trebles are much more pronounced, although there may be a very slight reduction in bass. I also notice the soundstage moving more forward away from the center of my head, which is awesome. Certain female vocals sound as much as a foot in front of me.

I have a pair of Stax Lambda Signatures which I believe use the 0.9um film and they are very impressive headphones, interested to hear your experiences with them on the home built versions....

Chaz
post #925 of 1634
Thread Starter 
I like your headband. It looks nice!

Believe it or not, I also go from electrostatic headphones to electrostatic loudspeakers amd now back to headphones. Building ESL is fun too. smily_headphones1.gif

I have tried 0.9, 1.5, 2, 3.5, and 6 microns Mylar. While the thin ones sound pretty good, you'll find them to be a little bass light. The 0.9 mircron Mylar has a problem with temperature. The tension tends to change with the change in temperature. But it sounds really nice.

Wachara C.
Edited by chinsettawong - 5/12/13 at 4:56pm
post #926 of 1634

"he likes the Orpheus better."

 

The vocals on those were just crazily ecstatic if anything


Edited by ayaflo - 5/14/13 at 10:35pm
post #927 of 1634
Quote:
Originally Posted by chinsettawong View Post

I like your headband. It looks nice.

Thanks, not finished yet, want to put a nice foam pad on it but its just one of these ear defenders taken apart - http://www.clarkforest.com/shop/safety-clothing/ear-defenders/peltor-optime-2-ear-defenders

Quite nice a light, easily adjustable and fits our size of phones really well (luckily I found some at work!)

Chaz
post #928 of 1634
Thread Starter 
Quote:
Originally Posted by Chazman View Post


Thanks, not finished yet, want to put a nice foam pad on it but its just one of these ear defenders taken apart - http://www.clarkforest.com/shop/safety-clothing/ear-defenders/peltor-optime-2-ear-defenders

Quite nice a light, easily adjustable and fits our size of phones really well (luckily I found some at work!)

Chaz

 

Good idea! 

post #929 of 1634
Right so I know it's been quite a long time since I last posted that I've been progressively working on them in between getting a new job.

Wachara- I hasve got some antistatic gel and seems you working reasonably well, it's got rid of all the problems that I was having with rubbed graphite (was having in terms of discharge, hum and crackling things like that) however I do find the resistance is very high and I need to turn the amplify quite high to get any decent volume also although very very precise (even more so than my Lambda signatures!!) the bass is lacking using the same 2um sheet and similar tension. Do you only put one coat of the gel on (all I have done so far)? Just one side? I think the bass issue is to do with the resistance because when it was much lower with the graphite it was very very punchy!

Thanks for the help,

Chaz
post #930 of 1634
Thread Starter 
Hi Chaz,

I don't know for sure what your problem is. But you can try a few more coatings so that you get very homogenous surface resistance. Yes, you coat only on one side of the diaphragm.

If you have to turn up the volume much more when using the antistatic gel, then the stuff you're using might have too high resistance. A good resistance would be around 1 x 10^7 ohm per square.

Wachara C.
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