Everything's handmade, so no 3D model unfortunately...

@Lucas Taboada: McEar just told me the Dreve Fotoplast is allowed to be shipped by plane and sent me the safety datasheet.

Quite similar to what @Brooko already measured: Some more tips (left channel only, aligned @ 700 Hz): Yellow: Stock Green: Comply Blue: SpinFit (CP100) Red: Shure Olive Purple: Shure Silicone

Datasheet S IO

Finally got a Fibae 3 Custom in my hands for doing some measurements: And here's how it compares to the universal shell demo unit: As expected the ~8 kHz peaks moves to higher frequencies due to deeper insertion. Overall the demo unit will represent the custom sound quite well I think.

Actually the residual, absolute noise level will be higher when going balanced. That's because doubling the components doubles the noise. The signal will be doubled too, but doubling noise means +3 dB and doubling sinal means +6 dB. So the maximum signal to noise ration becomes 3 dB better -...

How will balanced lower the noise floor - don't you mean it will increase the signal to noise ratio?

Any success yet? Did Ethan send you some measurements?

That's actually a pretty old topic and has been discussed and researched for decades now. That coupler would be pretty bad then, wouldn't it? A good standard coupler represents the average human ear below 10 kHz or even above, if go for the new (not so cheap) GRAS. That being said, not...

I honestly don't think it's worth the extra work. The information that is most relevant is what FR the IEM delivers to an average ear - that includes resonant peaks from the closed ear entrance as well as the effects of different insertion depths. Knowing if certain aspects of the FR are due to...

Thanks! Yes, took a cheap KZ IEM as a starting point to create my own positive dummy shell. Crossover, tuning etc is all self-made. Also made the cable :ksc75smile:

My first build :ksc75smile: 2 BAs in universal shell.

Can someone point me to frequency response measurements of the EE lineup? I know @crinacle 's Dayton measurements, but looking for more accurate ones. Maybe even official graphs @Jack Vang?

Do it! :ksc75smile:

Have you checked for inverted polarity?