[johnchpark]

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

 

[musmecca]

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!

 

[johnchpark]

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

 

[musmecca]

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.

 

[shdh]

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.

REW Export Measurement as Text:

My initial measurement is available on curvedb.com

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.

 

[tedbender84]

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.

 

[mattmatt]

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.


REW Export Measurement as Text:



My initial measurement is available on curvedb.com

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.

This is great! How did you manage to seal the tube with the coupler? Mind sharing?

 

[tedbender84]

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?

 

[tedbender84]

Or I can go with much simpler build and use GV-32830(is this cl combined with twfk in one module?) and what is tubing length and dampers recommendation?

 

[Bassiklee]

That would not be ideal. It would work, and make sound. Do a search. There are at least two different crossovers for CI/TWFK posted in these pages. Start with the GK circuit, for example

 

[tedbender84]

That would not be ideal. It would work, and make sound. Do a search. There are at least two different crossovers for CI/TWFK posted in these pages. Start with the GK circuit, for example

So your recommendation is to go for a plain single GK driver? Correct?

 

[Bassiklee]

The GV is a HODVTEC/TWFK. The GK is the CI/TWFK

 

[Bassiklee]

So your recommendation is to go for a plain single GK driver? Correct?

Since you already have the drivers, no. My recommendation is to search for the crossover specs and build it yourself. It's two components.

 

[musmecca]

That would not be ideal. It would work, and make sound. Do a search. There are at least two different crossovers for CI/TWFK posted in these pages. Start with the GK circuit, for example

I have done the twin ci and single twfk build. It is difficult and requires a crossover. I would start simple.

 

[tedbender84]

I have done the twin ci and single twfk build. It is difficult and requires a crossover. I would start simple.

What is a crossover configuration - low pass for cl and hi-pass for twfk? Or cl - low pass and twfk full range, or cl - full range and twfk hi-pass?