[wolffyx]

Which software are you using for the design? Both for the shell and the component fitting?

Right now I am making the crossover for the drivers and I use VituixCad.

 

[swtnate]

I managed to make my CIEMs have low freq(at last). The issue was that at the low freq instead going in the ear it was escaping on the other tubes that are for the EST and BA's(didn't research why is this happening and how I can fix this bit it is a big possibility that is from the tube dimensions). The fix was to add dampers to both EST and BA's(the smallest one for the EST (gray or white one) and some green one for the BA's).
My measurement mic was reading the freq ok, the problem was/is from the design itself .

It would mean that the tubing was not fully sealed to the driver or the tubing wasnt fully glued to the sound bore or there was a hole in the tubing or, if you are printing tubes, there wasnt good integrity of the tubing through out the shell.

 

[wolffyx]

It would mean that the tubing was not fully sealed to the driver or the tubing wasnt fully glued to the sound bore or there was a hole in the tubing or, if you are printing tubes, there wasnt good integrity of the tubing through out the shell.

I tested out with some isopropyl alcohol(and some wire to see if it catches somewhere) on the dd to see if there are any leaks from the dd to the nozzle(to the other tubes) and there are 0 leaks. When I added the dumpers(they are added at the nozzle right on the exit) to the EST and Ba's tubes(the tubes are 3d printed) the low freq came back and for testing I removed the EST dumper and then again the low freq is gone(same if I remove the Ba's dumper and let est one instead). From what I did I reached the conclusion that the low freq instead of going into the ear it was escaping trough other tubes(when I tested the EST and ba's are not glued into the case, this might be the issue too, I will test out)

 

[wolffyx]

Here is a picture with how I made the dd have low freq (the tube that has no dumper is the one from the dd) and there is a link with the design https://photos.app.goo.gl/icqNGE6KFffp6asf7

 

[xrecode]

I tested out with some isopropyl alcohol(and some wire to see if it catches somewhere) on the dd to see if there are any leaks from the dd to the nozzle(to the other tubes) and there are 0 leaks. When I added the dumpers(they are added at the nozzle right on the exit) to the EST and Ba's tubes(the tubes are 3d printed) the low freq came back and for testing I removed the EST dumper and then again the low freq is gone(same if I remove the Ba's dumper and let est one instead). From what I did I reached the conclusion that the low freq instead of going into the ear it was escaping trough other tubes(when I tested the EST and ba's are not glued into the case, this might be the issue too, I will test out)

try rewire ur dd with flip polarity (?)

 

[mattmatt]

This is my 4 drivers that i told you guys , i just finished today

look really good! what resin and dye are you using for the white?

 

[wolffyx]

try rewire ur dd with flip polarity (?)

Tried and that didn't help. Tried running them one by one and that still didn't make any difference. Conclusion I must have for both est and ba's a dumper to make the dd have low freq

 

[swtnate]

Tried and that didn't help. Tried running them one by one and that still didn't make any difference. Conclusion I must have for both est and ba's a dumper to make the dd have low freq

That doesnt really track. Something else has to be going on. The DD doesnt require occlusion to produce low frequency. The only way it would escape through tubes is to have a leak or a share sound path. Dampers on a the armatures shouldnt effect the presence of low frequencies.

 

[jcaro]

Tried and that didn't help. Tried running them one by one and that still didn't make any difference. Conclusion I must have for both est and ba's a dumper to make the dd have low freq

What is this tube (I highlighted it in red)? It looks like a vent added to the DD tube to the outside. Solid red line seems to represent a leak to the DD, while the dotted red line is the tube you want sound to follow. I'd try plugging this vent and having a listen.

 

[swtnate]

What is this tube (I highlighted it in red)? It looks like a vent added to the DD tube to the outside. Solid red line seems to represent a leak to the DD, while the dotted red line is the tube you want sound to follow. I'd try plugging this vent and having a listen.

Bingo! OR, add a damper to this tube, probably yellow, and test for an increase in lows. If you see the low end pop-up, you know you will get much more with the hole sealed. That being said, prepare for an increase in back pressure and the potential for ear fatigue.

 

[tonybuild]

Your driver choices, how they're wired, cap values, resistor values, what sound signature you're going for. Maybe I could learn something

Hi again, in this model ( white and wood ) i use sonion 2389D and sonion 38d1 woofer . I wired 5ohm resistor and 22 cap on one of the 2389(no center pad), and 2.2 cap on the other 2389(no center pad) .

On the woofer i wired 20 ohm resister reversed .

2389d,12 mm tube with green damp at 3-4 mm .

Woofer no damp, just smallest tube. 16 mm tube with 1mm ID .

 

[tonybuild]

look really good! what resin and dye are you using for the white?

I mixed Egger with white resin pigment. I bought it in the Michael’s store .

 

[tonybuild]

This is short video of making it.
Dont pay attention on the drivers
On the video . In the beginning, I was experimenting with twfk. But I end up with sonion 2389d