Home-Made IEMs
Sep 20, 2020 at 9:36 PM Post #11,581 of 13,624

johnchpark

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For multi tubes (4 tubes), do you make one big bore down the nozzle, stick with the drivers in, and then seal it by adding more UV resin down rhe bore?
Or drill 4 separate holes?
im still not good with the dremel, so i cant seem to get many holes without running out room or cracking the shell
 
Sep 20, 2020 at 9:57 PM Post #11,582 of 13,624

musmecca

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For multi tubes (4 tubes), do you make one big bore down the nozzle, stick with the drivers in, and then seal it by adding more UV resin down rhe bore?
Or drill 4 separate holes?
im still not good with the dremel, so i cant seem to get many holes without running out room or cracking the shell
Start with a fine point diamond burr, not a drill. See my pic...I work from left to right. Once you are in with a burr, start moving up sizes until you get the diameter you want. It usually is best to get one big hole then fill in if you are doing 3 or more holes. I don't use drill bits, as they will catch on the edge and crack your shell. Last, you must have big ears....mine are big and I can only fit 3 tubes with at least 1 being a 1mm!
 

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Sep 20, 2020 at 10:01 PM Post #11,583 of 13,624

johnchpark

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Start with a fine point diamond burr, not a drill. See my pic...I work from left to right. Once you are in with a burr, start moving up sizes until you get the diameter you want. It usually is best to get one big hole then fill in if you are doing 3 or more holes. I don't use drill bits, as they will catch on the edge and crack your shell. Last, you must have big ears....mine are big and I can only fit 3 tubes with at least 1 being a 1mm!

thanks!
I got the diamond tip set so i get what youre saying. Ill give it a shot!
And yea, my ears are on the bigger side...i can fit a Z1R in comfortably. Problem is, the bend is almost at a 90 degrees, so i have to drill from two sides i think
 
Sep 20, 2020 at 10:26 PM Post #11,584 of 13,624

musmecca

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thanks!
I got the diamond tip set so i get what youre saying. Ill give it a shot!
And yea, my ears are on the bigger side...i can fit a Z1R in comfortably. Problem is, the bend is almost at a 90 degrees, so i have to drill from two sides i think
Are you using acrylic? If so, check your wall thickness and curing time. Shoot for 2MM thickness. If you have very thick walls, you may be over-exposing which will solidify the canal...you will have to drill every time.
 
Sep 22, 2020 at 5:28 PM Post #11,585 of 13,624

shdh

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Could someone with an IEC60318-4 compliant coupler share their measurement of a Knowles CI-22955 driver.

Please use an 8mm long, 1mm inner diameter tubing with no filters from the driver to the coupler.

If you have a different recommendation for tube length from balanced armature to coupler, I'm all ears.

I measured using REW: 20Hz to 20KHz, 128k length, 8 sweeps.
1600809915312.png


REW Export Measurement as Text:
1600809765928.png



My initial measurement is available on curvedb.com
graph (2).png

I'd like to start creating an open database of balanced armature driver response curves, and also impedance curves on curvedb.com - if you would like to contribute, please send me a private message on here. :ksc75smile:
 

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Sep 24, 2020 at 4:21 AM Post #11,586 of 13,624

tedbender84

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Hi guys.
This year I made two pairs of home made ciems - masm6 and masm 3 pro and really fall in love with diy ciem making.
At present moment I’m thinking of building ciem with Sonion drivers and want to taste sound of their EST drivers. I have on hands 4 pcs of 38d1xj007, 4 pcs 38AJ00 7Mi/8a, 4 pcs of 2389 drivers and pair of quad EST electrostat. I wish to ask what will be the best crossing options to combine this drivers? I open for any advice/recommendation and open for discussion.
 
Sep 24, 2020 at 5:38 AM Post #11,587 of 13,624

mattmatt

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Could someone with an IEC60318-4 compliant coupler share their measurement of a Knowles CI-22955 driver.

Please use an 8mm long, 1mm inner diameter tubing with no filters from the driver to the coupler.

If you have a different recommendation for tube length from balanced armature to coupler, I'm all ears.

I measured using REW: 20Hz to 20KHz, 128k length, 8 sweeps.
1600809915312.png

REW Export Measurement as Text:
1600809765928.png


My initial measurement is available on curvedb.com
graph (2).png

I'd like to start creating an open database of balanced armature driver response curves, and also impedance curves on curvedb.com - if you would like to contribute, please send me a private message on here. :ksc75smile:
This is great! How did you manage to seal the tube with the coupler? Mind sharing? :)
 
Sep 24, 2020 at 8:58 AM Post #11,588 of 13,624

tedbender84

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I have a question about CI-22955 plus TWFK-30017 build. I have a bunch of them and want to make a pair for my friend. He want a good low end and good treble, he mainly listens modern electronic dance music. Can I just use for example 2xCl plus a single twfk without electronic crossover?
 

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