I disagree with the bass (wondering here especially since most people won't agree with you here, please check your replacement model for its bass again) and treble impressions. The treble is not smooth but still far from a PRO Ultrasones or a T90 (and still, the HD 800 has its own treble peak flavor, a toss-up in this case) while the bass presence, impact is noticably more/better than the HD 800. I agree on the extreme seperation and the superb imaging and soundstage. In general I consider the K812 more genre-proof than the HD 800 and ultimately (also thanks to its bottom end) much more universal if you also watch movies or game.
I sincerely doubt my impressions for these will change due to the crack issue, as so far it hasn't gone past the outer surface of the cup and where it connects to the frame. It does not effect anything inside the cup at this point.
The comments about bass versus the HD800 were qualified in my impressions. I said that I simply disagree with those who say the HD800 is lacking in its bottom end response and, when driven properly, I feel the HD800 has some of the best low end punch (NOT quantity) of any dynamic headphone out there. When folks tell me the bass on the HD800 is weak, I just have to assume they aren't amping it well. The HD800 is an incredibly picky headphone, and I would say the majority of the rigs I've heard it on don't do it justice.
The bottom end of the K812 is very satisfying, don't get me wrong. Unless you're looking for something specifically for bass performance, I think the K812 will not disappoint in that regard. However I'm a bit overly-picky when it comes to the sense of physical impact in my headphones, especially as my references for this are---in my opinion---two of the best performing headphones in that regard: the Abyss and HD800 driven from a Liquid Gold. That I would even think to compare the K812 with these headphones though speaks highly of the K812; I think it's in the same league, just with its own unique take.
As for treble, again, my comments are in purely relative terms: I'm not hearing the same peakiness as the stock HD800. It's quite possible the peaks on the K812 just aren't as bothersome to me as the HD800's, sure. I'm not trying to suggest that the K812 has an Audez'e-like smoothness to it up top or anything though. In my impressions I tried [as best I could] to indicate the balancing-act that was going on with the K812. I went back and clarified that a bit.
I'm totally willing to revise my impressions if I somehow get a much bassier and harsher sounding K812. Then I will promptly send it back to AKG or re-crack it and advise others to do the same on their sets as a mod LOL. Seriously though, if others disagree with me that's a-okay. I feel no pressure to try and retune my impressions at this point having spent a good deal of time and energy trying the K812 on different rigs. Sometimes language can be tricky when talking about this stuff though, and I'm pretty sure we'd actually agree more than it might appear if we get past semantics.
Edited by MuppetFace - 1/27/14 at 6:21am