[piotrus-g]

Thats absolutely massive silverprout. You should be proud! Looks great. Is there any CIEM maker that does third order or more as slope (18 db/octave)?

JH Audio with 4th order in Roxanne, Rosie, Angie and Layla?
 

  It don't work for me (the attenuation is poor), even with tested Ø0.1, Ø0.2, Ø0.3, Ø0.4 ,Ø0.5 and a lot of lenght between 10mm to 200mm... silicone, PVC and teflon tubing.

How it's possible that 0.1 or 0.2 didn't work? 10mmx0.1m would give you hell of a low pass.

 

[Xymordos]

Strange...it worked really well for me too, and the bass was actually too much when I tried it without any passive components. It was a nice steep slope too!

 

[raptor18]

@Silverprout
Plea forgive me but I don't understand the answer 4. 4 db/octave?

@piotr
Which CIEM Makers do third order?
And how does JH fit electronics for a 4th order? As I understand, it would require physically big components?

 

[Silverprout]

  JH Audio with 4th order in Roxanne, Rosie, Angie and Layla?
 
How it's possible that 0.1 or 0.2 didn't work? 10mmx0.1m would give you hell of a low pass.

 
 

  Strange...it worked really well for me too, and the bass was actually too much when I tried it without any passive components. It was a nice steep slope too!

Perhaps i'm wrong, i should perform new tests.
But i'm very curious that BA manufacturers uses expensive textile dampers instead of simple drilled blocks.

 

[ForceMajeure]

The low pass filter is not the tube but the in  "C" part in the exploded view, you can see it explained in this 
https://www.youtube.com/watch?v=C9qmtRcUWM0
 
Quote:

 
Well, I thought the Shure se846 acoustic filter was pretty much really long tubing as seen by the exploded view of them.
http://cdn.shure.com/brochure/upload/105/SE846-exploded-view-english.pdf.
 

 
 
 

 

[Flukes]

 

Yea, the last page shows the filter represented by E, but I'm just saying that a long tubing would be an equivalent? to the Shure's acoustic filter.

 

[raptor18]

I don't get it. I thought you wanted to filter before the driver so the driver doesn't have to play unprefereable frequncies.

Edit: I will need to do some reading on audio design

 

[Silverprout]

 
The low pass filter is not the tube but the in  "C" part in the exploded view, you can see it explained in this 
https://www.youtube.com/watch?v=C9qmtRcUWM0
 

Someone has measured the result of this tortured tube ?
 
In my desings i absolutely need an munimum attenuation of 35-40dB @ 800Hz

 

[ForceMajeure]

I am not sure if I am right, but if you take the the impedance graph compared to the frequency part you can usually see where the crossover take place (because of the nature of BAs you can see impedance swing)
for example
http://www.innerfidelity.com/images/ShureSE846WhiteFilterSample2.pdf
 

 
Apparently the first crossover is at 200hz, then looking at the drop in frequency response graph at 200hz seems to be around 8db 
the second crossover is around 2khz
 
Here is another cool pic from the se846 thread

 

[tranhieu]

I have some 846 drivers lying around. If anyone interested I can have a look at its xo, though it should be nothing but conventional Butterworth again.

 

[mattmatt]

Hey guys, just want to know if this would a good idea for DIY shells. I've read from marozie's instructable that he used smooth on crystal clear resin and dipped in into nail polish which I've read is not ISO 10993. So instead of using nail polish how about using CA Adhesive or Super Glue which I read can be used with wounds. Also watched Heisenberg do it. Breaking Bad. Would that be a good idea in order to have hypoallergenic shells?

 

[Silverprout]

Hey guys, just want to know if this would a good idea for DIY shells. I've read from marozie's instructable that he used smooth on crystal clear resin and dipped in into nail polish which I've read is not ISO 10993. So instead of using nail polish how about using CA Adhesive or Super Glue which I read can be used with wounds. Also watched Heisenberg do it. Breaking Bad. Would that be a good idea in order to have hypoallergenic shells?

Cyanoacrylate is an adhesive glue, not a structural resin, you should experience retraction problems.
 
 
There were a lot of imperfections in my test rig (very, very fast measurements)

 
Dynamic driver
green : 10mm filterless Ø1.5mm
purple : 20mm filterless Ø0.1mm
Blue : 10mm filterless Ø1.5mm (+Xover)
 

 

[Silverprout]

With an very very old 22955 (from my trashbin) and improvised coupler.
 
10ohm serial 22955
clear blue : 10mm filterless Ø1.5mm
orange : 20mm filterless Ø0.1mm
deep blue : 10mm filterless Ø1.5mm (+Xover)
 

 

[Flukes]

  With an very very old 22955 (from my trashbin) and improvised coupler.
 
10ohm serial 22955
clear blue : 10mm filterless Ø1.5mm
orange : 20mm filterless Ø0.1mm
deep blue : 10mm filterless Ø1.5mm (+Xover)
 

Would you be able to replicate the dynamic driver (purple) with the CI? Maybe using a longer tube or dampers?

 

[Silverprout]

 
Would you be able to replicate the dynamic driver (purple) with the CI? Maybe using a longer tube or dampers?

IMHO a damper should reduce only a bit the spike... about 6 or 8dB (it is just a thin piece of cloth and the tube impedance is already too high), and the tube is very long (20mm), more should exhibit phase / impedance / integration issues.
All the way : the attenuation is near to 0dB @ 800Hz, way too high for my application.