[swtnate]

In the above example what I'm having the biggest issue with is where the C3 lead on the TWFK is terminating. It doesn't appear to be on either the negative or positive solder pad?

TWFK is a dual driver combining an FK with a WBFK. The C3 in the diagram terminates on the positive of the WBFK.

 

[piotrus-g]

TWFK is a dual driver combining an FK with a WBFK. The C3 in the diagram terminates on the positive of the WBFK.

Exactly, also important - wire one cap after the other - this is to create a 2nd order crossover.

EDIT: haha I found someone made this build http://philchang.me/portfolio/posts/DIY-CIEM-2.html
Hope this helps -

EDIT2: you know after reading it I don't think it will help that much

 

[StephenJames]

https://hearshearingandhearables.co...y82UVKImqRU4ynZZ8C5q3FNvultAEIvcaAuEpEALw_wcB

will change your whole experience.

I'll definitely check these out.

I did have a bit more success recently with a 2nd ear impression, where I didn't have my mouth as open as the first time. Surprisingly this is fitting better when I sing, than the impressions I had made with my mouth more in an open singing position. I found that odd, as it it's kinda contradictory to the reason singers use a bite block when getting them made. I have a gig tonight, so I'll see if they hold up there.

But if the soft wraps help my ACS in ears, and my first attempts , then I'll be happy with that too.

 

[citiesandshapes]

Exactly, also important - wire one cap after the other - this is to create a 2nd order crossover.

EDIT: haha I found someone made this build http://philchang.me/portfolio/posts/DIY-CIEM-2.html
Hope this helps -

EDIT2: you know after reading it I don't think it will help that much

In looking more into this build I know a lot of people have had difficulty fitting it into shells, especially if they’ve got smaller ears. Would a SMD board be a viable workaround?

 

[piotrus-g]

In looking more into this build I know a lot of people have had difficulty fitting it into shells, especially if they’ve got smaller ears. Would a SMD board be a viable workaround?

Use small SMD components and you should be fine in terms of real estate. Don't put through-hole resistors in it. You can use PCB board but if the space is limited PCB will further limit your space.
2xCI+TWFK is some of the most basic IEM configuration there was back in the day, lots of companies made it work so...

 

[discus123]

Sandpaper worked, still makes sound.

I hv followed your way to do same, but I don't hv knowles 30095, I just used 31736 instead. I removed the cover with sandpaper, very happy after sand off the cover the FR are still perfectly matched.

I hv a question, where is the sound come out. From 1, the small hole or from 2, the narrow gap. I'm afraid I do it wrong while I insert into the shell and might damged it. Lastly, do I need to sand the other side out also, or one side is enough.
Thanks.

 

[mattmatt]

Always wanted to build this but people say it's hard/complex. Why so?

@dhruvmeena96 always mentions it's hard.

 

[talyak]

I hv a question, where is the sound come out. From 1, the small hole or from 2, the narrow gap. I'm afraid I do it wrong while I insert into the shell and might damged it. Lastly, do I need to sand the other side out also, or one side is enough.
Thanks.

i think with the top removed you are getting sound from the entire top. thats the point of the mod, it removes any part of the driver that is shaping or directing the sound. hopefully allowing for more detail. you only sand off one side, and attach it to the shell by the other side. you definitely dont want glue or resin on any of the part you sanded down and you dont sand down the opposite side.

 

[slakoth453]

I hv followed your way to do same, but I don't hv knowles 30095, I just used 31736 instead. I removed the cover with sandpaper, very happy after sand off the cover the FR are still perfectly matched.

I hv a question, where is the sound come out. From 1, the small hole or from 2, the narrow gap. I'm afraid I do it wrong while I insert into the shell and might damged it. Lastly, do I need to sand the other side out also, or one side is enough.
Thanks.

That whole metal plate is the diaphragm. Left one looks a bit damaged from soldering but should be fine if they are still matched.

 

[dhruvmeena96]

Always wanted to build this but people say it's hard/complex. Why so?

@dhruvmeena96 always mentions it's hard.

Because CI are big thats why
And it becomes hard to fit in normal shell with normal tubes back when we didnt use 3d.printing tubes

 

[BadgerMcBadger]

fotoplast should be good in the container until the expiration date even if i opened it right?

 

[musmecca]

Always wanted to build this but people say it's hard/complex. Why so?

@dhruvmeena96 always mentions it's hard.

I've made this build numerous times. It sounds fantastic. I don't find the drivers to be too big..its the crossover that takes the space to execute.

 

[discus123]

i think with the top removed you are getting sound from the entire top. thats the point of the mod, it removes any part of the driver that is shaping or directing the sound. hopefully allowing for more detail. you only sand off one side, and attach it to the shell by the other side. you definitely dont want glue or resin on any of the part you sanded down and you dont sand down the opposite side.

oh! This is my 1st time open the cover of the BA driver. ha, ha the sound is from there. thanks, I learn a lot from you.

 

[discus123]

That whole metal plate is the diaphragm. Left one looks a bit damaged from soldering but should be fine if they are still matched.

You are right. your eyes are very good indeed. I hv damaged the solder pad. Luckily, I solder it back but still hv sound and the FR looks alright.

 

[BadgerMcBadger]

do you think i can fit a 6x11mm capacitor in a ciem shell? im building my first ciem so im not quite sure yet