[chinsettawong]

   
 
I know your measure very well so they must  sound great. How do you determine the tension of the mylar? Was it just trial and error until  you got it right or are there some calculations?

 
 
Yes, I did my trials and errors until I got it right.  I don't know a formula to calculate it.

 

[ondesx]

Hi Inuponken,
 
Good job indeed !
 
I saw that you used Reztore : I still have somewhere one bottle for test purposes, but It seems that this product lasts unfortunately not enough in time ... Licron seems to be a much better candidate ! 
 
What is your opinion ?
 
OndesX

 

[inuponken]

   
Very nicely done headphones, but the question is, how do they sound?
 
Did you compare them to any well known headphones? How do they stack up? What is the sound signature like?

 
Thanks,
I only have three SR-X-MK3 and SR-407.  Bass is slightly lower than SR407 but sound is very clear and wide. It is my main rig now.

  

 

[inuponken]

  Hi Inuponken,
 
Good job indeed !
 
I saw that you used Reztore : I still have somewhere one bottle for test purposes, but It seems that this product lasts unfortunately not enough in time ... Licron seems to be a much better candidate ! 
 
What is your opinion ?
 
OndesX

 
 
Thank you.
 
No problem so far but only 3 weeks since I build....  I will use Licron for next if Reztone is not lasts longer.

    

 

[ondesx]

Please Inuponken can you tell us :
 
- the thickness and quality of the film you used for the membranes
 
- the total weight you apply to your jig for the tension of this film
 
I read the other interesting parameters in one of your posts (spacers and polarization).
 
Thanks for these precisions.
 
OndesX

 

[inuponken]

Diaphragm = 2u Mylar film (e-bay)
Dust filter (front only) = 0.9u Super ultrafilm (http://www.indoorspecialties.com/)
Frames (cups): 3/4” Red oak board + wood stain + Gross Polyurethane paint (Home depot)
Stators: t=0.94mm FR4 PCB (e-bay PCB depot) + “KRYLON Digital Photo & Paper Protectant” splay for the coating (office).
Dust filters: t=0.94mm FR4 PCB (e-bay PCB depot)
Spacer & Diaphragm: t=0.5mm FR4 PCB (e-bay PCB depot)
Contact Cement: DAP Weldwood original contact cement (ACE hardware)
Plastic Rings for the ear pad: Cut out from Compact Disc
Locking Rings for ear pad: from HE-5 Ear pads (e-bay)
Top plates: 3/16” black acrylic sheet (e-bay)
Nylon screws, small wood screws, shrink tubes…
Punching metal plates: Kenwood Excelon Speaker Grills (e-bay)
Cable: KOSS ESP950 extension cable (Koss service center)
Stax connector: from Kevin
Headband : form my SR-40 (Garage sale) + coat hanger
 
Tension = 180g (water bottle 120g + Clamp 60g) x 16pcs = Total 2,880g
2 gallons bucket for tensioning (ACE hardware)
2in.Spring Clamps for tensioning x 16pcs (Harbor Freight/Home depot)
Ozakra 16.9-floz empty bottles x 16pcs (from recycle bin in my garage)
Vinyl coated wire rope = water bottle <> Clamp (from my wife)
And dxf files from Wachara.

 

 

[kevin gilmore]

I'm finally getting around to making my own
 
http://gilmore.chem.northwestern.edu/electrostat1.jpg
 
hope to make at least a few stators out of the same glass used in the he90

 

[chinsettawong]

Those look really nice. Looking forward to seeing the finished product soon.

 

[davidsh]

How will you coat the quartz glass?

 

[kevin gilmore]

vacuum deposition.

 

[chinsettawong]

I printed out the back covers using my 3D printer.  I think they turn out pretty good.  
 

 

[Q Mass]

I do too! they look like they mean business!

This is probably like asking someone which of their children is their favourite, but which of your 'phones to you like best?

And which model should I attempt to emulate if I am a bass lover (not a full on bass head) who has a SRD-7 SB?

 

[chinsettawong]

If you like bass, then you want to make the headphones with good seals. My Omega and Orpheus clones both give wonderful bass. The JF clone isn't bass shy though. It's more natural sounding. It's more like you're listening to loudspeakers than headphones. As of now, it's my favorite.


Sent from my SM-N9005 using Tapatalk

 

[Q Mass]

Thanks man

One more question if I may?:
I have some of the 0.9u super ultrafilm that inuponkin mentions he's using as a dust cover a few post back .
I had bought it to use as diaphragm film, but maybe it isn't suitable?
Is there any reason that it wouldn't work?

Thanks for any and all guidance!

 

[chinsettawong]

Yes, I really like the sound from that super ultrafilm when it works. The problem is that the film is really sensitive to temperature change. If you use it as the diaphragm, you want to use thick spacers. Otherwise, your diaphragm will be very unstable. Even the heat from your body could change its tension.

Wachara C.