There are a few people that do, but everyone is basically measuring it their own way, with no standards to follow.
There are basically 2 ways you can go about it.
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You go with consistency as the main goal, these are the setups that uses iem adapters for buds, so they are more consistent in insertion depth and angle. Downside is that these are not realistic and not how we wear the buds. (this is the type my own bud graphs go for = meme level.)
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You go with realism, these are the ones that uses fake ears and the likes, to simulate more how they respond in our own ears. Downside is that, as with IRL usage, its very hard to put them on consistently and even more so when it aint your own ears.
Here is my graph of the LBBS using method 1.
and @tgx graph which is more about method 2.
in the end, I wouldnt bother using graphs with buds…
They arent “flat” like with iems, as mentioned above, bud graphs = memes.
Some of them do have somewhat of a pinna gain, but they are quite rare as most buds are tuned to be super smooth.
LBBS and the Smabat M2S Pro are the branded ones with this.
And for my own models, it would be the Lancer 1.