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Home-Made IEMs - Page 92

post #1366 of 2215
Quote:
Originally Posted by edba2000 View Post

Here is my recent project: CI+TWFK

 

 

 

 

great sound!!!! (wood isn't finished, yet)

 

Wow edba2000, impressive to say the least! (as do many others here for their effort). Does the placement of the drivers (angle, distance from opening) within the shell matter? And what method do you use to fix your drivers into position within the shell so that they do not move?


Edited by broww - 6/28/12 at 10:13pm
post #1367 of 2215
Quote:
Originally Posted by wz2000 View Post

Looks good! I thought about using wood aswell, haven't got around to trying yet. I did my covers with polymorph(pretty much the same as shapelock).

 

Judging from the pics, you didn't use any cap on the tweeter of the TWFK?
 

Yes, that's it - no crossover. The red filter is cutting the highs and the grey is optional. I have made a test without the grey but the highs are too harsh. (Others are using a white filter with the TWFK).

post #1368 of 2215

are the covers removable?

 

I'm wondering because you can get some pretty small countersunk screws, it'd be great to get back into the shell again

post #1369 of 2215
Quote:
Originally Posted by edba2000 View Post

Here is my recent project: CI+TWFK

Very impressive my friend!
post #1370 of 2215
Quote:
Originally Posted by broww View Post

 

Wow edba2000, impressive to say the least! (as do many others here for their effort). Does the placement of the drivers (angle, distance from opening) within the shell matter? And what method do you use to fix your drivers into position within the shell so that they do not move?

I don't think the angle of the drivers inside the shell really matter. The only important factor is the length of the acoustic tube. So, the distance from the opening is important. For the TWFK, the length should be the smallest as possible and for the CI (woofer), mainly because of the driver's size, the length can be bigger.

 

The drivers are fixed with glue.

post #1371 of 2215
Yes, smaller tube length and bigger tube diameter helps higher frequencies and other way round for woofer or lower frequencies , ie smaller tube diameter and larger tube length.As the sleeves/case are mostly hollow the drivers are directly attached on tubes and hold the drivers in place.
 
edba2000 how is the sound characterestic? because you didnot use any crossover how does the iem behave on complex tracs. Did you notice any phase shifts or overlapping of frequencies?
post #1372 of 2215
Quote:
Originally Posted by MuZo2 View Post

Yes, smaller tube length and bigger tube diameter helps higher frequencies and other way round for woofer or lower frequencies , ie smaller tube diameter and larger tube length.As the sleeves/case are mostly hollow the drivers are directly attached on tubes and hold the drivers in place.
 
edba2000 how is the sound characterestic? because you didnot use any crossover how does the iem behave on complex tracs. Did you notice any phase shifts or overlapping of frequencies?

 

All I can say is that the first listening test was disappointing!! 
 
Now, after some "burn in" hours they are much better. I hope to get even better SQ after 50 hours...
 
The sound is very balanced. The bass is not exaggerated, the amount is enough and very well defined (but clearly not for bassheads). Mids are enjoyable and the best of this design (IMHO). As you can see, I have used a grey filter, I think it's enough to cut some of the Mids/Highs. I still need to find some more tracks with interesting highs, to compare with my Beyerdynamic DT 880.
 
About the complex tracks: I need some more time to test some "Dave Matthews Band" tracks. Do you want me to test some specific track?
post #1373 of 2215
Quote:
Originally Posted by Greenbeast View Post

are the covers removable?

 

I'm wondering because you can get some pretty small countersunk screws, it'd be great to get back into the shell again

No, the covers are not removable. It is quite easy to cut the glue between the wood and the shell.

post #1374 of 2215

Here is my version for your perusal. Triple driver, a TWFK with an ED-23147:

 

Triple custom iem.jpg

 

 

I went for the crossover route. I have a cap on the tweeter of the TWFK and a 2nd order lowpass filter on the ED-23147 woofer. Also a brown filter on the TWFK. Here's the schematic of the thing:

 

iem xo.jpg

post #1375 of 2215

Just an idea...

 

We could start a small database with IEMs designs specifications. It could include the electric schematic, shell materials, some pictures, sound characteristics, comercial IEMs equivalents, ...

I have been reading this thread almost since the begining and the it was not easy to start a DIY project. The information is not organized!

post #1376 of 2215
Quote:
Originally Posted by edba2000 View Post

Just an idea...

 

We could start a small database with IEMs designs specifications. It could include the electric schematic, shell materials, some pictures, sound characteristics, comercial IEMs equivalents, ...

I have been reading this thread almost since the begining and the it was not easy to start a DIY project. The information is not organized!

that would be great, i am just embarking on this journey and you're right, the information is very dispersed regarding what people have accomplished and it what way.

post #1377 of 2215

Thanks for the reply MuZo2 and edba2000. This is seriously one of the most amazing thread so far.


Edited by broww - 6/29/12 at 8:54am
post #1378 of 2215
Quote:
Originally Posted by wz2000 View Post

Here is my version for your perusal. Triple driver, a TWFK with an ED-23147:

I swear you could sell them, no one would know you made them biggrin.gif Great job
post #1379 of 2215

I will post pictures of my hybrid ciem in day or two. twfk + ie8

post #1380 of 2215

After three weeks of listening and tweaking and three iterations this is final and works quiet well. TWFK for highs and mids and ie8 for bass.

It has recessed sound tubes to prevent wax from entering the sound tubes, on face plate there is bass port for IE8. I have used mmcx female plug on shell and right angled male on cable.

PICT0030.JPGPICT0033.JPGPICT0024.JPGPICT0027.JPGPICT0028.JPG


Edited by MuZo2 - 7/1/12 at 9:17am
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