This is aimed at bit on the philosophical direction as well on the clear objectionist view. I think there are people saying that if two completely different headphones follow both reasonably well the Harman curve (or can be through EQ brought to do so) and have sufficiently low distortion, they should sound the same. This would be the reducionist stance. I doubt that is true, since there are other, more subjetivist, criteria, like soundstage, imaging, transient decay and others, that should matter, although apparently it is for many of those criteria not fully understood how to measure these. But for example an electrostatic headphone has very fast transient decay and brings a feeling of naturalism that others are not capable of. And equally EQed Sennheiser HD650 and HD800s should still have a different soundstage.
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