Yeah definitely. Especially with regards to frequency response; all of them are so close to neutral that most people would see them as flawless. I think what I really meant was that every headphone at the high end has one or two things thar they do much, much better than others, so relative to that, all high-end headphones are "flawed" in some way.

All the high end headphones I've tried are flawed to some degree, and I've heard most of them. But at that level none of the flaws are particularly glaring.

> Imaging, resolution, dynamics, that's all part of what we experience. So I think it's fine to rate headphones by those metrics, because the experience is what matters. But I have yet to see any conclusive proof that those things are not influenced by FR in some way.

Are there any measurements at all for those properties? I haven't seen anything that does a reasonable job of quantifying them.

Difference can be massive depending on which amp you're looking at. I had a Valhalla 2 and an A90 and the difference was like night and day. I actually bought the A90 to replace the Valhalla 2 but just couldn't convince myself it was better; it's just such a different experience.