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Home-Made IEMs - Page 119

post #1771 of 5606

Hello guys! I want building single armature iem. I want to but knowles ED 29689 this driver situated in etymotic er4 and build my own armature iem. But i find DIY kit on taobao.

what do you think is it good idea or not? Recently I listened Grado GR08 and I lovely this sound. But he's used moving armature driver it's new type of armature driver and he never sold. Perhaps you know other more better single armature then knowles ED 29689, help me please.

post #1772 of 5606
Quote:
Originally Posted by koshernyituzz View Post
 

Hello guys! I want building single armature iem. I want to but knowles ED 29689 this driver situated in etymotic er4 and build my own armature iem. But i find DIY kit on taobao.

what do you think is it good idea or not? Recently I listened Grado GR08 and I lovely this sound. But he's used moving armature driver it's new type of armature driver and he never sold. Perhaps you know other more better single armature then knowles ED 29689, help me please.

The frequency response for that driver isn't all that appealing. 

http://www.knowles.com/eng/content/download/4346/59501/version/2/file/ED-29689-000.pdf

post #1773 of 5606

What you recommended for building single driver armature, which driver is best to use. thank you.

post #1774 of 5606

Knowles ED29689
TWFK

Sonion 1700 But would be hard to get.
 

post #1775 of 5606
Quote:
Originally Posted by CMOS1138 View Post
 

The frequency response for that driver isn't all that appealing. 

http://www.knowles.com/eng/content/download/4346/59501/version/2/file/ED-29689-000.pdf


because this measurement is made with IEC126.

post #1776 of 5606

ED-29689-000, measured with IEC-60318-4 (IEC-60711):

 

Besides a drive voltage of 0.045 Vrms, the amplifier OI is 0.1 ohm.

post #1777 of 5606

Is this red filter at the end of the sound tube used like damper for smoothing frequency responce? if I can get a sound like etymotic er4? If single driver armature don't use crossover or something else leaves the driver Knowles ED29689 does not need to be adjusted. I understand correctly? thanks guys.

https://www.youtube.com/watch?v=CDF96zKd8Qk&feature=youtu.be

post #1778 of 5606

interesting, perhaps I will have to experiment with that driver at some point myself.

post #1779 of 5606
Anyone experiment with horn designs?
http://www.cylibby.com/horn/
Seem to be common on hearing aid
post #1780 of 5606
Quote:
Originally Posted by wjp007 View Post

Anyone experiment with horn designs?
http://www.cylibby.com/horn/
Seem to be common on hearing aid


Fitear F111 has horn-shaped titanium nozzle

post #1781 of 5606
Quote:
Originally Posted by wjp007 View Post

Anyone experiment with horn designs?
http://www.cylibby.com/horn/
Seem to be common on hearing aid

 

Lots of companies use a stepped horn design. The UERM uses a stepped horn for its tweeter portion. piotrus-g's CustomArt creations are mostly horn-loaded designs. LivezoneR41 use horn designs too. Actually, there are too many companies that use it that I can't really think of all of them at the moment.

 

FullCircle designed the 6.A with a stepped reverse horn for one set of woofers.

 

Actually, among this group, other than piotrus-g, I think tranhieu has been experimenting with horn designs as well.

 

As MuZo2 mentioned, only FitEar manages to use a continuous horn design with its F111 and Parterre, as well as an upcoming model.

 

A Libby horn might not be plausible as there might not be enough room; Libby horns are mostly used for BTE designs, AFAIK.


Edited by tomscy2000 - 6/11/14 at 10:12am
post #1782 of 5606

Does anyone have a suggestion on how to mount the BAs inside the shell? I thought about using super glue/tubing cement. Any ideas?

post #1783 of 5606
Quote:
Originally Posted by tomtomtom View Post
 

Does anyone have a suggestion on how to mount the BAs inside the shell? I thought about using super glue/tubing cement. Any ideas?

 

Generally, BA mounting is done with a type of UV-cured acrylic.

 

I suppose epoxy resin might be viable, though.

 

I would avoid using superglue, if possible, because of the fumes it gives-off, which may, potentially, cause damage to components.

 

Superglue fumes are even used in forensics, for the purpose of 'fixing' invisible fingerprints - cyanoacrylate fumes should not be underestimated and although some may disagree with me, I would personally never use superglue anywhere near balanced armatures; not for fixing them in place, nor for affixing tubing to the BA nozzles.

post #1784 of 5606
Quote:
Originally Posted by tomscy2000 View Post
 

 

Lots of companies use a stepped horn design. The UERM uses a stepped horn for its tweeter portion. piotrus-g's CustomArt creations are mostly horn-loaded designs. LivezoneR41 use horn designs too. Actually, there are too many companies that use it that I can't really think of all of them at the moment.

 

FullCircle designed the 6.A with a stepped reverse horn for one set of woofers.

 

Actually, among this group, other than piotrus-g, I think tranhieu has been experimenting with horn designs as well.

 

As MuZo2 mentioned, only FitEar manages to use a continuous horn design with its F111 and Parterre, as well as an upcoming model.

 

A Libby horn might not be plausible as there might not be enough room; Libby horns are mostly used for BTE designs, AFAIK.

Thanks, I knew the Libby horn would end up being too long.  

 

rinchoi has an interesting formula that estimates cutoff frequency and gain.  

 

http://rinchoi.blogspot.com/2013/06/suyama-fit-ear-f111.html

 

I was thinking of making my own horn by taking a larger diameter tube and heating the middle and stretching it (similar to what you do to make an eyedropper in science class from a glass tube). 

 

This would create a bridge from 2mm ID at the BA to 4mm ID.  The trick is you want to insert a damper close to the end to prevent standing waves, which wouldn't be possible given the increasing diameter.  A stepped design may suffice.  I just don't know if the formulas do a good job of predicting performance.  There was another thread on headfi of a user creating a universal BA design with a horn and it seemed promising.  

post #1785 of 5606

I would love to see a picture of a horn design actually implemented. I have red about the advantages for high frequency response, I just can't imagine having sufficient space in the ear canal to make one unless you are only using one sound port. I suppose it would be possible to bore out the end of the high frequency port after assembly but I would be concerned with getting debris inside the rest of the sound tube.

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