I don't have a wealth of knowledge here, but I was under the same impression as you. Tuning to that curve doesn't inherently grant you magical accuracy powers, organically speaking. General favorable human hearing tuning target. And that is what I thought more or less was under the "reference" banner. The other 2 not absolutely sure. They get thrown around and likely misused all the time.
I can see Harman tuning being favorable to, say, a company like Apple that wants to maximize the appeal of their earbuds but isn't really interested in specialized or boutique tunings. Even still I don't see how it translates to accuracy. In terms of accuracy across the board I would give the nod probably to the Elysium of all the IEMs I've heard-- but I wouldn't consider the Elysium really a reference or a neutral tuning. It had by far the most life like and natural instrumental & vocal presentation I've heard though.
Reference tuning would encapsulate extreme detail retrieval on the micro level with excellent dynamics and imaging will excel. I feel that macro dynamics lends itself to a more open and natural tonality which in my opinion would be a balanced tuning. I feel that Traillii is the most balanced monitor that I have heard on any source I’ve paired it with. Balanced to me is a monitor that excels in tone and timbre but also technicalities and stage. Traillii is not perfect but to me is the most balanced due to its tuning. In my opinion from my experience, the implementation and tuning are what is important not necessarily driver type. Technology has def improved upon with BA and DD as well As bone conduction.
Thinking further about Isabella and I wouldn’t place this monitor in any of these categories. I would say it’s closer to balanced when talking timbre and tonality but no where near the level of Traillii. I have heard others say Traillii is a version of reference but I disagree because of the upper harmonic scoop. Reference to me is anole VX. Balanced is Traillii and Nuetral would be Eden or the Soft ears Turri. Harman is closer to neutral with a sub bass boost
I’m not the most knowledgeable here and I’m just relaying what I’ve learned on my journey. Please if I said anything amiss, please be gentle and don’t attack me. I would rather learn and hear what others think as well as I’m always willing and wanting to learn more!
Thank you @Rockwell75 for the great questions recently. Love that it gets the community thinking and talking.
Cheers. Those are all valid points. I think for me "reference" means a total absence of coloration. As I've stated elsewhere the u12t is probably the most prominent example of this of all the IEMs i've heard (minus its slight bass boost). It's incredible for "monitoring" or analytic purposes...when you listen to something like the Rolling Stones you can literally picture some dudes in a studio with their instruments...but the romance is gone. You mentioning the Traillii got me thinking of "natural" versus "realism" and how I don't think they're quite the same thing. Traillii blew me away with its sense of holographic realism, and the Anole VX was spellbinding with its incredible resolution-- but neither of those were as natural in their tonality as the Isabellae or Elysium. Oh the hairs we can split in this hobby lol
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