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Home-Made IEMs - Page 140

post #2086 of 2097

Hm, I just realised that it does have a vent. What do I need to do with it? As long it's uncovered within the shell it's okay already?

 

Also, maybe you can just rearrange the layout a little to fit in all the drivers? HODVTEC is like a DTEC in size, so it's quite square from the front as opposed to the flatter profile of CI.


Edited by vector1 - 7/29/14 at 10:46pm
post #2087 of 2097

I think you can just leave it open? Blocking the hole gives a difference sound too :P The DTEC will probably stick out of the shell for me, don't think it will be suitable unfortunately 

post #2088 of 2097
Quote:
Originally Posted by tranhieu View Post
 

FitEar also uses a similar method. Though I wouldn't recommend it for the cost involving isn't suitable for a DIY project, unless you wanna go all out.

 

 

Actually there is no real benefit with using this method unless you have right compensation for it. So for DIY and to compare one measurement to other you can just use a tube instead.

 

post #2089 of 2097

^ That tube is no different than a downgraded 2cc coupler, and you still need to compensate in the end.

 

Anyway I've never tried this route before. But I think the idea is to have better seal when measuring since everyone's earmoulds are unique. The probe used there is a G.R.A.S 711 so there's no need for compensating later.

post #2090 of 2097

The stainless steel chunk with the microphone inside is the 711 that can record the actual frequency response without the need to compensate right :P?

 

If you can buy things off China I can recommend a very good tool for DIY measurements

post #2091 of 2097

If its on taobao can you post a link pls.

post #2092 of 2097

I hesitated before since the seller told me it is borderline illegal. But anyways, hopefully DIYers can benefit from this before anything happens.

 

http://item.taobao.com/item.htm?spm=a1z09.2.9.13.vsgG3j&id=37135316408&_u=ukqv5el5e70

post #2093 of 2097

Wait only 499 yuan?! o.O 

 

What brand is that?

 

Anyway if it's illegal you might need to keep it to PM.


Edited by tranhieu - 7/30/14 at 4:08am
post #2094 of 2097

The guy apparently copied a IEC711 and used a similar microphone that has comparable performance for DIY use. From my ARTA tests with my UERM the performance seems to be quite well. It only requires your computer to have a sound card that is nice and flat.

post #2095 of 2097

I haven't checked in on this thread in quite a while, but there's some amazing stuff happening here! Kudos to everyone pushing the limits of DIY tech.

post #2096 of 2097

Actually my intent was not about seal, but trying to mimic the actual dimensions of the ear and impedance it presents to the custom IEM.  From my own earmolds, I know I have quite a bit of difference in the diameter of my left and right ear canals.  I thought this might be a better of way of tuning the IEM than using a straight pipe.  It seems that BA drivers are a lot more sensitive for this, but maybe I'm striving for false precision here.  

post #2097 of 2097
Quote:
Originally Posted by wjp007 View Post
 

Actually my intent was not about seal, but trying to mimic the actual dimensions of the ear and impedance it presents to the custom IEM.  From my own earmolds, I know I have quite a bit of difference in the diameter of my left and right ear canals.  I thought this might be a better of way of tuning the IEM than using a straight pipe.  It seems that BA drivers are a lot more sensitive for this, but maybe I'm striving for false precision here.  

 

I would say if you have the time, go for it, but have you actually looked at the ear canal beyond the mold? As I understand, whatever you see up to the first bend on the mold will be solid acrylic, so it won't affect the sound at all. Only the parts that you don't actually keep in the mold will become part of the "cavity" before the eardrum. At the very most, you can go up to the 2nd bend depending on how deep the original impressions are?

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