[eunice]

Yes, that could be it. What do you think of the rest of the curve compared to MASM3? (because of the air leak I have no listening test yet)

Hard to tell. You have quite a roll off in bass on both graphs. That doesnt show in my measurements of MASM3 and BS6 should have plenty of bass too, so the rolloff is probably related to your setup. Other than that, MASM 7 seems slight V shaped compared to MASM 3, but not too V shaped. So hard to tell exactly how that would sound, MASM 7 is probably closer to harman target.

 

[kmmm]

Hard to tell. You have quite a roll off in bass on both graphs. That doesnt show in my measurements of MASM3 and BS6 should have plenty of bass too, so the rolloff is probably related to your setup. Other than that, MASM 7 seems slight V shaped compared to MASM 3, but not too V shaped. So hard to tell exactly how that would sound, MASM 7 is probably closer to harman target.

You are right. The coupler I used is probably to deep (about 2-3cm) It was just something I made up in les then a minute to check what was going on with the broken item. What do you use as a coupler? what's the distance from the CIEM to the mic?

 

[kmmm]

You are right. The coupler I used is probably to deep (about 2-3cm) It was just something I made up in les then a minute to check what was going on with the broken item. What do you use as a coupler? what's the distance from the CIEM to the mic?

My measuring setup: I use miniDSP UMIK-1 microphone, it fits perfectly into 12mm ID PVC tube from a garden shop. Calculated the length of the tube for 2ccm volume. Then I let a friend 3D print a cap with conical holes for the tubes.

Works like a charm. I use roomeqwizard (mac user here )

Other mics work well too.

What was the length?

 

[eunice]

What was the length?

I calculated the length to be ~17mm to achieve 2ccm volume in a tube of 12mm diameter. But I measure at different length (say 14mm, 17mm and 20mm) to see the difference in my measurements.

I can couple tubes quite well with a 3d printed adapter, but when I measure finished CIEMs with blue tack my graphs look pretty much like yours.

How the pros are able to measure finished CIEMs is still a mystery to me.

 

[dhruvmeena96]

Masm 7

Unfortunately there's an air leak in the left BS6 tube
Have to redo the whole thing

The working right shows an interesting curve compared to MASM3 pro.
Whats happening at 13k?

the issue is mic, its tube, sealing and its calibration

yup, MASM7 follows Harman Target kinda, but is not as flat as 100Hz to 1.1kHz AKG N5005.

MASM 3 Pro beats everything on treble range.


New Series Incoming
based on same DNA as MASM

Evoluzione(open for DIY)

still in testing period

 

[Choy Wei De]

I got this CI30120 driver, does any one know which is which polarity?

 

[stephensynanta16]

Have anyone tried integrating the tube into the 3d printed shell design? Will different tube material (resin) have a siginificant effect to the sound?

i wonder if resin will affect the sound significantly.

 

[stephensynanta16]

I got this CI30120 driver, does any one know which is which polarity?

it looks similar to CI-22955, on the 22955, according to the manual, the one closest to the side is negative, the one furthest from the side is positive, the center one is center tap, dunno what center tap is, imma newbie.

[___[+] [c] [-]_]

 

[Xymordos]

I got this CI30120 driver, does any one know which is which polarity?

Pretty sure the solder pad closer to the edge is negative

 

[Choy Wei De]

it looks similar to CI-22955, on the 22955, according to the manual, the one closest to the side is negative, the one furthest from the side is positive, the center one is center tap, dunno what center tap is, imma newbie.

[___[+] [c] [-]_]

Pretty sure the solder pad closer to the edge is negative

Thanks everyone

 

[wardy]

I've got a few questions, I'm starting to really get into this and shell building is coming along nicely however I have a couple of questions

1) How on Earth do you get opaque shells wanting to get a solid white (this is just for faceplates btw

2) Can anyone EU / UK based recommend me any dyes as the ones used by most people on here are really hard to get / would have to wait ages

3) What are you guys using for Freq response test

Thanks so much

 

[eunice]

I've got a few questions, I'm starting to really get into this and shell building is coming along nicely however I have a couple of questions

1) How on Earth do you get opaque shells wanting to get a solid white (this is just for faceplates btw

2) Can anyone EU / UK based recommend me any dyes as the ones used by most people on here are really hard to get / would have to wait ages

3) What are you guys using for Freq response test

Thanks so much

1) Pro3dure has beautiful white resin.
2) no idea on dyes. But McEar.de has the white pro3dure and other colors.
3) search this thread for 2cc coupler. I use minidsp umik and RoomEqWizard

 

[stephensynanta16]

Just've finished printed the resin shell, the damper mount & 7mm of the tubing is integrated in the shell design, the rest will be regular tubing.

Yes it looks rough & sketchy, even i wonder if it'll work or if it'll sound different because of different tubing material.

 

[Choy Wei De]

Just've finished printed the resin shell, the damper mount & 7mm of the tubing is integrated in the shell design, the rest will be regular tubing.

Yes it looks rough & sketchy, even i wonder if it'll work or if it'll sound different because of different tubing material.

Personally I think the material of the tube matters. But not sure will it be noticeable enough.

I think the best way to test is to print a short tube and compare with normal tube, e.g a 15mm of 2.0mm ID tube. Or if you really want, build a simple single driver like RAB/RAF, ED using resin printing.

 

[stephensynanta16]

Personally I think the material of the tube matters. But not sure will it be noticeable enough.

I think the best way to test is to print a short tube and compare with normal tube, e.g a 15mm of 2.0mm ID tube. Or if you really want, build a simple single driver like RAB/RAF, ED using resin printing.

Do u had the schematic for single driver RAB or ED? it might be interesting to build 3 pair of them, full resin printed tube, half resin half tube, full regular tube.