The coupler can't simulate the real human ear, but resembles.
Yes it does, but the coupler without a pinna is nothing more than a waveguide.
When you compensate for the wave guide you end up with the real SPL at the entrance of the waveguide.
The Pinna and the rest is not involved so why compensate it ?
We can't find the perfect compensation target for their own ears. Because human HRTF is different with each other.
Then why bother trying to compensate the measurement anyway with a method you prefer as 'best fitting' ?
I want to measure the IEM in Internationally Verified way. Not my way.
That's why I reference the IEC standard, ISO standard and Target which verified in AES.
Then you need to create at least 4 plots and neither of those plots will actually show what came out of the IEM.
You should post the raw plot, the IEC standard, the ISO standard, any AES verified standards (OW) and that's it.
That's what you've done so far and that's a good thing.
I merely placed some question marks regarding the 'standards' and hoped/thought you would be willing to think out of the familiar boxes and be able to come up with something refreshing like O & W research.
IF I were ever to measure IEM's (they don't interest me so I won't) than I would try very hard to come up with a more accurate compensation than the ones others use for their own reasons to try and get better correlation to reality.
See what pirates think of those graphs and if they correlate to their findings.
That's what I am trying to convey.
THINK about what happens in the coupler, WHAT you want to know, WHY there are different standards that come up with different results and investigate WHY they differ and see the logic and possible flaws behind it. Why would a speaker sound be preferable and why one should compensate for things that aren't there ?
The OW curve is designed to compensate for measurement 'errors' that are not applicable in this case and even though it may be closest to the way you perceive them, it cannot possibly be the correct compensation regardless if others think so.
Why not ask the OW guy, he is active in several forums and can tell you if you can apply the OW target directly to an IEM inserted to a coupler.
I understand you don't feel the need to research this and wonder why, as you seem to be someone that likes to measure and likes to find the correlation between perceived sound and raw data and thought thats why you joined.
If you just want to do what others have done before and come up with identical results (which don't seem to be fully identical) than that's an option and IMO a missed chance to actually improve on creating more accurate plots.
Willing to bet there are a lot of pirates here willing to think and debate it with you.
Lots of peeps here with IEM experience and a few guys that measure them (not acc to exact
standards)