Thanks, it looks like we've got a different understanding of
@arar's post:
My understanding (and desired tuning) is that this isn't about the bass as such, but "density", fullness in the lower mids presentation, potentially even some emphasis pm the mids. Looking at Sony XBA-N3's FR graph it's lots of lows with actually recessed lower mids if we look at what low mids are - 200Hz-700Hz (or even 1000Hz according to some sources).
(see below)
My experience with basshead closed backs (Shure SRH1540, 1more triple drivers) is that this amount of bass doesn't sound like "density" (thickness), but rather just... boomy bass. I don't mind the bass to roll off a little, but the thickness should be there which are not mutually exclusive. Harman curve seems to really be the opposite of what we're looking for, and most of IEMs seem to be tuned to some sort of Harman target for some reason.
I just got the Sennheiser HD600, haven't had a chance to give them a thorough listen, just burning them in, but they seem to have this (tbc), as well as Focal Elegia. (see below again for their graphs).
Correct me if I'm wrong, I am don't have much heapdhone experience, but this is my understanding.
I've made screenshots from
https://reference-audio-analyzer.pro/ since it's not using images that I can link to: