At the tend there, you bring up a great point...
I was trying to explain to my wife "why I have all these headphones", and I couldn't really articulate concisely WHY the he6se v2 wasn't a REPLACEMENT for my HEDDPhone. It's not so much a matter of "better", but more that they are just so drastically "different" in what they do. To analyze the merits of one over the other was an exercise in frustration for me.
Did you find the same to be true? (Besides the obvious aspects of soundstage, bass "thump"/authority, and instrument separation.)
I am in a bit of a love/hate relationship with my HEDDphone. Partially because I sold my HEKv2 to purchase it (!).
I feel the need to justify myself on that one:
1. I was
dying to try the HEDDphone
2. The HEKv2 wasn't
that dissimilar to the HE6se
3. The HEDDphone is less sensitive than the HEKv2, which made more sense with my setup. OK, that's dumb.
4. My HEKv2 was heavily used and the HEDDphone was open box from a retailer
In hindsight, I do regret the swap, but the HEDDphone itch may have continued to bug me.
The HE6se is a very temperamental headphone with a lot of silly requirements - but once you get that going, it's incredible. Nothing kicks harder or faster, imaging is perfect, timbre is great, perhaps a little intense but if I had one headphone, it would be this, broken headband or otherwise.
The HEDDphone requires nothing beyond gobs of power and barely scales at all. If you can feed it enough juice, you're going to get the same experience no matter what the source or what the material.
The HEDDphone is... flawless.
As in, it doesn't have any significant flaw. Is the treble super clear? No, but it's all the detail you need with none of the harshness. Are the mids nice and full? Yeah, perhaps a touch honky. Is the bass nice and detailed? Yeah, not the biggest thing in the world, and it won't kick the hardest, but you're not going to miss a beat there either.
There's nothing "incorrect" about the sound signature, yet at the same time it doesn't have a single quality that makes it stand out. What's worse - to be annoyed by a headphone's quirks, or to be annoyed by a headphone's lack of excitement?
In that sense, the HE6se and HEDDphone are completely complementary - one is all quirk, and the other one is no excitement.
Seriously, if you took the HD600 and doubled the detail, you'd have the HEDDphone. Is this good? Is this bad? What does this mean?
How often do you see someone use the word "flawless" and then crap all over it?
EDIT: Now that I re-read all this, I brought up the HEDDphone because I clearly don't care about looking like an idiot wearing a headphone.