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Home-Made IEMs - Page 87

post #1291 of 2997
Quote:
Originally Posted by tomscy2000 View Post

Quote:
Originally Posted by edba2000 View Post

  Here is my first attempt: Sonion 2323 + Sonion 33a007    ...The result was not what I was expecting!

Nice! Not what you were expecting in what way? That's a TF10-like setup right there; was it unexpectedly unlike a TF10?

He didn't mention any crossover what so ever. He also didn't use any sound damper. It looks good tho.
post #1292 of 2997
Quote:
Originally Posted by delladood View Post


He didn't mention any crossover what so ever. He also didn't use any sound damper. It looks good tho.

He has used some basic cross over, you can see the registor. Not shure on sound dampers & their placement.

post #1293 of 2997

Here is the material:

http://dentala2z.co.uk/epages/eshop133027.sf/en_GB/?ObjectPath=/Shops/eshop133027/Products/PRE10054

 

It is a great product! Hard as a rock!!!

The first test I have done was a 1mm thick shell! -> completely stable and solid

 

The only "con" is the resulting surface. It is not shiny, as you can see in the pictures.

post #1294 of 2997

This is the design I have followed:

 

iem.jpg

1 uF cap and 10 ohms resistor

green damper for the 2323 driver

yellow damper for the 33a007 driver

(the dampers were removed at the time of the pictures)

post #1295 of 2997

Great to see some life back in this thread. I've also started making my own iems. I'm using a TWFK with an ED23147 as the woofer.

 

I've done a pretty complicated crossover incorporating a lowpass filter and two highpass filters. Also an L-pad to drop the sensitivity of the woofer, with the added benefit of smoothing it's impedance changes a bit.

 

I've already cast a solid epoxy piece as a test. Now I need to figure out a method for casting a hollow piece, which is difficult as the epoxy has a very long cure time.
 

post #1296 of 2997

I thought I'd join in on this thread. After all, "How hard can it be?"....

 

Here are some pictures of a hollow shell I managed to make:

 

img0704vy.jpg

 

img0698h.jpg

 

Got a few ideas on the next steps but still unsure.

post #1297 of 2997

It can be really difficult. Especially developing a proper crossover.

 

I found that it's almost easier to cast a solid piece and hollow it out with a dremel, than to try to cast a hollow one. This is with the epoxy I'm using though. It might be different with other materials.

 

Also if anyone is interested, I measured full impedance graphs from the TWFK and ED-23147 drivers. These are quite useful for figuring out needed component values for crossovers.

post #1298 of 2997

Very interested in your graphs.  Can you post or send via PM?

 

Thanks
 

post #1299 of 2997

Ok, here's a screencap from a spreadsheet I made. These measurements were made using the process mentioned here: http://sound.westhost.com/tsp.htm

 

As for the accuracy of my tests, you can compare these to the few values provided by knowles(impedance @500hz and @1khz). They're quite close.

 

These drivers have some pretty substantial impedance changes. Especially the ED-23147, those peaks are huge!

 

impedance charts.jpg

post #1300 of 2997

Thanks for graphs.

post #1301 of 2997

Can't wait to see how LaaGs turns out!

post #1302 of 2997
I think I'm just gonna keep it simple. No crossovers as my soldering skills are rubbish.
As others have said, accoustic dampers should surfice (eg: Sony xba).

Just ordered a pair of TWFK and Ci with a grey filter for the rwfk and red for the ci driver.
post #1303 of 2997

I don't think the Sony XBA's have acoustic dampers, they diaphragm is specifically tuned to a different frequency in each driver.  Either way, they don't suffice, I can't listen to the XBA-3 or XBA-4 for more than 30 minutes, I can't stand them.

post #1304 of 2997
Quote:
Originally Posted by kiteki View Post

I don't think the Sony XBA's have acoustic dampers, they diaphragm is specifically tuned to a different frequency in each driver.  Either way, they don't suffice, I can't listen to the XBA-3 or XBA-4 for more than 30 minutes, I can't stand them.


Hmm I listened to XBA3 for a few minus and I liked the sound. I listened it from clip+ though from Samsung galaxy S it sounded very lacking

post #1305 of 2997

While I'm still working on my crossovers for my triple driver project, I made these:

 

Iems_shure_driver.jpg

 

 

I took drivers from and old pair of Shure E3C iems, that had a broken cable. Single Knowles BK-28562 driver inside. Good midrange, bass and a treble are a bit lacking, but there's only so much a single driver can do...

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