[zeed]

No 3d printing here, just good old fashioned wax dipped impressions, investment from hydrocolloid, dark smoke Fotoplast SI O lv shells mixed using black resin obsession. Triple drivers wired GK style.

Amazing skill as always!

PS: did you receive my private message?

 

[Smgwee1]

What kind of 3d printer did you use? I guess it's the uv epoxy type of print, right? It looks very high quality. You could do some polishing, and apply the laquere you would normally use on a standard custom as a finish, and I think they will look even better. How did you 3d scan the impression?

It's SLA printer, i got it done with a audiologist. It's traditional impression, then he scanned with impression. The editing that is a killer, a combination of mesh mixer, fusion 360 and blender. this is my first time dealing with 3D softwares..

 

[ThanosD]

It's SLA printer, i got it done with a audiologist. It's traditional impression, then he scanned with impression. The editing that is a killer, a combination of mesh mixer, fusion 360 and blender. this is my first time dealing with 3D softwares..

Yes, I thought so too. Great work. What are you planning to put inside?

 

[jambul]

This is my try to diy iem,
Using rab 30233+wbfk 30095 +ed 29689 all in series..
No cross over, all driver work in fullrange

The rab and wbfk being modified by take off the front sound tunnel

I heard this sound balanced from. Mid bass to high

Any idea to. Enhance the sound?

Thanks in advance

 

[piotrus-g]

Y-tubing story all over again... How do you guys deal with affecting frequency response while connecting two or more drivers to one tube?
For example: I glued vented 33AJ007i/9 as a low and 2380 as a mid/high together and stretched 2ID bore around two sound outlets. The connection was smooth - without any hops or sharp edges inside the bore. Then measure it - 3300 FR was almost the same, but 2389 changed significantly between 6 and 9 kHz (level was decreased) and more uneven than single 2389 FR with one bore. The damper makes thing even worse.
Another example - 2389 as mid and E25ST glued together and connected in the same way as 3300 and 2389. Now the 2389 FR looks almost good, but the lack of 6-9kHz is visible in E25ST Frequency response.
Same with 3800 and 3100. - 3100 with a gap between 5-10kHz.
Any ideas? Strange thing is that the problem is always on FR of this "smaller" driver in connected and glued pair. How do you deal with it? Or this is just the thing that is always happening and there is nothing to do about it...

I can't watch you struggle with this so
Imagine that sound is water - what happens when you increase the pressure of water running through a garden hose? The flow capacity is a finite number.

Food for thought. Hope that helps

 

[Jedrula1]

I can't watch you struggle with this so
Imagine that sound is water - what happens when you increase the pressure of water running through a garden hose? The flow capacity is a finite number.

Food for thought. Hope that helps

Thank you for an answer! Thats very true. Air from physical point of view is a liquid with low density and viscosity, so the rules are the same as in liquid flow mechanics.
But... my measurements was made with only one working driver from the pair in y-tubing. First measurement - only 2389, second - only 33AJ007i/9 and finally third with both connected together. The issue was the most visible in first measurement. So the pressure was the same, or even a bit lower, due to bigger inner volume of the tubing caused by stretched part, as when connecting one sound tube to one driver. Later I can upload some photos od y-tubing and measurements to visualise the problem.

 

[Jedrula1]

Got measurements! We'll focus only on 2389 - thats why 3300 is not connected. Setup:

Upper: 2389 connected to 2ID 12mm tubing. Bottom: 2389 and 3300 connected into 2ID 12mm tubing stretched gently at the end. Measurements of 2389 (Pink - upper setup, blue - lower setup):

Look at the mess that is happening around 2kHz and between 4-9kHz on the blue FR. Any ideas?

 

[zeed]

So, I can see a shift of the 2,5khz and 5khz (pink) to left and the overall peaks are a bit tamed down (cyan).
Are you sure the tubing lenght is exactly the same?
From the picture it seem that the tubing on the 2 drivers is longer than the one on the driver alone.
The 2389 on the second setup is wired alone or togethet with the 3300 driver?

 

[Jedrula1]

So, I can see a shift of the 2,5khz and 5khz (pink) to left and the overall peaks are a bit tamed down (cyan).
Are you sure the tubing lenght is exactly the same?
From the picture it seem that the tubing on the 2 drivers is longer than the one on the driver alone.
The 2389 on the second setup is wired alone or togethet with the 3300 driver?

Length is almost the same - measured right now, the difference is 0.2mm.
Second setup is wired 2389 alone - the problem affects 2389 mainly.

 

[piotrus-g]

Got measurements! We'll focus only on 2389 - thats why 3300 is not connected. Setup:

Upper: 2389 connected to 2ID 12mm tubing. Bottom: 2389 and 3300 connected into 2ID 12mm tubing stretched gently at the end. Measurements of 2389 (Pink - upper setup, blue - lower setup):

Look at the mess that is happening around 2kHz and between 4-9kHz on the blue FR. Any ideas?

block the spout of the 33AJ and measure again

 

[Jedrula1]

Yeah, that makes a difference.... yellow graph is the new one - almost the same as pink.

Good to know that tubing is not a problem, but the second driver. So 2389 and 33AJ just does not fit together in one tube? I have similar issue when connecting 2389 to E25ST or 3800 to 1723WT07/9 module - always this smaller one (E25ST, and 2323 from 1723WT07/9) is affected somewhere between 5-10kHz frequencies. Solution is to tube together two similar-size, or eve the same, drivers?

 

[zeed]

How did you block the spout of the 3300?
I think the problem could due to the fact that the tube is streched to allow 2 drivers and in fact it reacts as a reverse horn tube, giving this strange behaviour.
If for blocking the spout of the 3300 you put some material and in this way you remove some of the added volume to the tube, then it’s like you were using a straight 2ID tube instead of a stretched (rev horn) one.
Just my thoughs

 

[Jedrula1]

How did you block the spout of the 3300?
I think the problem could due to the fact that the tube is streched to allow 2 drivers and in fact it reacts as a reverse horn tube, giving this strange behaviour.
If for blocking the spout of the 3300 you put some material and in this way you remove some of the added volume to the tube, then it’s like you were using a straight 2ID tube instead of a stretched (rev horn) one.
Just my thoughs

Just a very little amount of blue tack inside the spout. No volume change at all

 

[piotrus-g]

Yeah, that makes a difference.... yellow graph is the new one - almost the same as pink.

Good to know that tubing is not a problem, but the second driver. So 2389 and 33AJ just does not fit together in one tube? I have similar issue when connecting 2389 to E25ST or 3800 to 1723WT07/9 module - always this smaller one (E25ST, and 2323 from 1723WT07/9) is affected somewhere between 5-10kHz frequencies. Solution is to tube together two similar-size, or eve the same, drivers?

Solution is to connect the other driver

 

[Jedrula1]

Solution is to connect the other driver

Yeah, thats what I thought.. gonna do some attempts and share my results here later. Dzięki piotrus-g