staticV3
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Acoustic output impedance, yes. Not electrical impedance.You are talking out IEMs with wildly differring impedance?
The knowledge imparted to me by some very smart people like @oratory1990 and @Mad_Economist, as well as some personal experiences taking part in relevant research.What is the basis for your claim?
If we could expect two IEMs EQed to the same target using one acoustic load, to still have identical response playing into another acoustic load, then we could simply find the transfer function between, for example, the RA0045 and B&K 4620, and that would allow us to instantly upgrade all RA0045s to B&K 4620 levels of accuracy.
In reality, no "one" transfer function exists, as it is dependent on the output impedance of your headphone or IEM. Each IEM design will produce its own, unique transfer function.