[dhruvmeena96]

Small question, I found a very strange driver, code PER88-1626a, it is some sort of drivers used in etymotic ER4S, as I was told. Anyone has information about it? I think it’s a special version of ED-29689 or sonion 2323.

Nope

That's the oldest ER4(I mean 20th century one) driver by star microelectronic and was known as rbb-04D2-ps With sub name of PER88-1626a

 

[wolkegeist]

Nope

That's the oldest ER4(I mean 20th century one) driver by star microelectronic and was known as rbb-04D2-ps With sub name of PER88-1626a

Thanks for the information dhruv. I saw the spec of the RBB line up, and the RBB-04D2-ps doesn’t have spout, but this one has, maybe it’s the 04B2 one? Btw has anyone got the old ER4 design? Driver -> zobel -> 100ohm right?

 

[dhruvmeena96]

Thanks for the information dhruv. I saw the spec of the RBB line up, and the RBB-04D2-ps doesn’t have spout, but this one has, maybe it’s the 04B2 one? Btw has anyone got the old ER4 design? Driver -> zobel -> 100ohm right?

Yup
Its B series

 

[dhruvmeena96]

1.575mH is inductance of ED29689
7.1ohm is 500Hz Resistance/Impedance

 

[fredcrys]

Lacquer is for creating a smooth surface finish. If the surface is not smooth your skin will not relax after inserting the CIEMs and you will feel pressure points after wearing the CIEM for longer time. But other than lacquer you can also polish with Dreve Polishing Compound and polishing wheels.

Would this work "Dreve Glysol 1000ml LP Cleaner Clean IEM In-ear Monitor Remove Stickiness"? Aliexpress and if this cleaner works do I still need the Polishing compound?

Is hard to get Dreve, nicefit, Proc3dure in the USA which means I have to get it in Aliexpress or other sites overseas, that is why I want to make sure to get exactly what I need since the return of materials will take forever.

Thank you guys for the replies

 

[wolkegeist]

This is for those who have access to Sonion drivers.
I have some new Sonion 2389D(Dual driver). This is the best midrange and upper midrange/lower treble driver ever made period.

I recently helped my friend build a pair as a true successor to Savant.

Build

Sonion 2389D(internal parallel) + 22ohms
Knowles ED30761

same as the savant tubing and damper

U-pad
R parallel or R2 = 50ohms
R series or R1 = 3ohms

i just used google images

hot is +
cold is -

well, its balanced so polarity doesn't matter. For those who are just new to Fixed impedance attenuating circuit, the driver first interact with parallel resistor to drop all impedance peak and rising response down to flat, and then series resistor to actually compensate the impedance loss
it provides constant load to amplifier



for this circuit, this is 4db attenuation with 20.44ohms flat impedance all over the place

this works like a charm

20.44ohm resistance(its same impedance for all frequency) with ~110dB of sensitivity






Attenuation pads are amazing if damping factor is kept low. They keep the FR intact and also eats up noise, distortion etc.

They also linearizes impedance and phase plot while keeping the required impedance we want

I was given a pair of combine Sonion 2389 and 17A003, which i cam up with an idea.
If we cross 2389 with 2.2uF, we has a magnitude impedance of 14.38ohm, pretty close to 17A003 impedance @500Hz which is 14ohm. And wire them parallel to have an impedance of 7.07ohm. They have pretty much the same FR.
Then I saw your post about using 2389D as a successor to FED, I think I can use this driver too. But how do ya calculate pi attenuator tho, and why fix impedance pad and not L-pad

 

[dhruvmeena96]

I was given a pair of combine Sonion 2389 and 17A003, which i cam up with an idea.
If we cross 2389 with 2.2uF, we has a magnitude impedance of 14.38ohm, pretty close to 17A003 impedance @500Hz which is 14ohm. And wire them parallel to have an impedance of 7.07ohm. They have pretty much the same FR.
Then I saw your post about using 2389D as a successor to FED, I think I can use this driver too. But how do ya calculate pi attenuator tho, and why fix impedance pad and not L-pad

You can do that....it will work good.

The reason why I chose to do a pi attenuation was because it was balanced on signal line and also increase power handling capabilities. It has less effect on FR points where impedance strikes.

Try both and you will get it.

 

[zekester]

Would this work "Dreve Glysol 1000ml LP Cleaner Clean IEM In-ear Monitor Remove Stickiness"? Aliexpress and if this cleaner works do I still need the Polishing compound?

Is hard to get Dreve, nicefit, Proc3dure in the USA which means I have to get it in Aliexpress or other sites overseas, that is why I want to make sure to get exactly what I need since the return of materials will take forever.

Thank you guys for the replies

Try lightning enterprises for all of the correct materials. You’ll find fotoplast and lacquer 3 as well as the duplicating material. Quick shipping, great service. There are other sources as well, but that should get you started.

 

[dhruvmeena96]

@Ivan TT @IvanNOON @eunice @Xymordos @everyonepresent here

The zobel by Ivan TT works flawlessly on ED29689
3kHz peak is 7.5ohm(original was 30ohm) whereas DCR is 3.75ohm

And is full flat on impedance

And with 20ohm series resistor, it already sounds better than ER4SR(and I mean really better). The power loading on ED29689 is way better. It sounds like serious business . if I compare it, it sounds like ER4S without the need of amp

Damper used is brown

I used brown, since FR effect due to change of impedance is very minimum after zobel, so brown damper works like green damper as the change in FR region in upper mid is very minimum.

 

[Xymordos]

@Ivan TT @IvanNOON @eunice @Xymordos @everyonepresent here

The zobel by Ivan TT works flawlessly on ED29689
3kHz peak is 7.5ohm(original was 30ohm) whereas DCR is 3.75ohm

And is full flat on impedance

And with 20ohm series resistor, it already sounds better than ER4SR(and I mean really better)

Great! Was planning a build using the 29689, so this'll come in handy. Thanks!

Anyone knows where to get 2389D in Asia?

 

[dhruvmeena96]

Great! Was planning a build using the 29689, so this'll come in handy. Thanks!

Anyone knows where to get 2389D in Asia?

Its 2389 in parallel with single spout.

You can get two 2389 for now....I get that from India but they dont do international service


Tanotis India mega store(its a local electronic mega store)

Tanotis online doesnt have it, but they will get that in near future

 

[Xymordos]

Its 2389 in parallel with single spout.

You can get two 2389 for now....I get that from India but they dont do international service


Tanotis India mega store(its a local electronic mega store)

Tanotis online doesnt have it, but they will get that in near future

it's much easier to work with a single spout though, and Taobao doesn't have the newest Sonion drivers

 

[wolkegeist]

@Ivan TT @IvanNOON @eunice @Xymordos @everyonepresent here

The zobel by Ivan TT works flawlessly on ED29689
3kHz peak is 7.5ohm(original was 30ohm) whereas DCR is 3.75ohm

And is full flat on impedance

And with 20ohm series resistor, it already sounds better than ER4SR(and I mean really better). The power loading on ED29689 is way better. It sounds like serious business . if I compare it, it sounds like ER4S without the need of amp

Damper used is brown

I used brown, since FR effect due to change of impedance is very minimum after zobel, so brown damper works like green damper as the change in FR region in upper mid is very minimum.

Is the zobel 9 ohm 20uF? Or is this 10ohm? It's extremely hard to find 5ohm and 2 ohm MELF resistor/metal film resistor in my place, but I have a ton of 10 Ohm MELF resistor at home

 

[dhruvmeena96]

Is the zobel 9 ohm 20uF? Or is this 10ohm? It's extremely hard to find 5ohm and 2 ohm MELF resistor/metal film resistor in my place, but I have a ton of 10 Ohm MELF resistor at home

go with 10ohms, not an issue

 

[dhruvmeena96]

https://en.wikipedia.org/wiki/Composite_image_filter
go have a read

nice info