There are also much more affordable, Harman tuned headphones like the $300 Audeze Maxwell (not to mention a bunch of super cheap IEMs).That's true re loudspeakers. I don't own any Genelec, but I think of them as technically the best, and they're still really quite expensive, so I think speakers have a fair ways to go for that excellent performance to trickle down in price over time. Perhaps great speakers are more challenging to make to a tight "good value" budget than headphones. The thing with headphones is they're already at lower distortion than many speakers and they're very receptive to EQ, unlike speakers, well at least in terms of significant EQ improvements. And you've obviously got your E3 & Stealth as some really good Harman tuned headphones that are sort of the pinnacle of Harman measured success albeit at the high end of headphone pricing. I mean I can see room for more affordable versions of measured excellence in headphones, but in terms of absolute sound quality I think we're at the limits for fixed target curve headphones - so that was more the angle I was going in my initial question.
I'd love for Amir to test the Maxwell and go into what differentiates headphones when they are all tuned to the Harman curve!