@Foofoobanana
Sounds like you're agreeing for the most part with
@conquerator2. But I do agree with you on the details of the HE400s being better. And we all know how smooth the mids of the HE400s. For the price it is just amazing, but it really falls flat when it comes to the really low end. It was a major disappointment for my first planar phones. The older HE400 is so much better in that regard.
Btw, IMO there's nothing wrong with the quality of soundstage/imaging with the X2. You won't believe how many times I looked at my speakers on my desk as if they were on.
The X2 doesn't have the widest soundstage (AKG7XX, HD800 are wide), but it does have good depth. And there's something that's just so convincing about its soundstage.
FYI, I have the X2 paired with a Valhalla 2/Bimby, which is an amazing pair IMO. When I first tried the X2 with the Valhalla 2 at a local meet, it was an ear opening moment (I did have the X2 prior to the meet).
Anyways, back to the subject.
I have to agree, if you want more clarity, it probably is a better investment to look into new cans than an amp/dac.
And anybody, please let me know if there's a direct upgrade to the X2. I just can't find any that has all the strengths of the X2 with better detail and other qualities of a higher end phone. I keep hearing the Foxtex Th-X00, but from what I heard and read it just doesn't have the soundstage.