c/p
Bass: The bass extension on these is amazing, think sealed Abyss or Audeze. Overall bass is too present though, and it can be a bit overbearing on certain tracks, again think Audeze. Bass is very textured similar to electrostat/HD800/Qualia bass, but with more quantity. The bass isn't visceral like the Abyss or HE-6 though. I'll get into some of this again later.
Mids: Overall average but I think there's a lot of room for improvement here with mods. Nice for most male vocals, but a lot of female vocals seem to have something missing. In fact, my biggest qualm with this headphone is that there's almost no presence. Not only is this a distant sounding headphone, but it's not involving at all. In fact, I have to put the volume up or things start turning into background music. I'd like to be able to play these at any volume level and feel as involved as I normally am. The lack of presence makes everything outside of the bass sound dead. I should shun them for this alone as I can't think of much worse to say about a HP, but I think it can be fixed. The HE1000 is where cymbals go to die.
Treble: I guess presence also falls into this area, but further up I'm fine with the treble. Not really noticing much sibilance on my unit, and treble sounds pretty clean. Not grainy like most dynamics, and not distorted or shelved off like some orthos. However, there's a lack of spacial cues/air present, so live albums can sound more like studio albums with clapping.
Impact: Don't expect the impact of the Abyss, HE-6, or Audeze here. These sound like they want to hit hard but then kinda push on the breaks at the last second...it's really weird. Bass impact for instance sounds a bit like the diaphragm is hitting a sponge before full excursion or something. I'm not sure if this is due to the asymmetrical magnet arrangement, but I haven't heard a headphone with this feature. Most stats don't hit hard, but they don't exhibit any slowing down before impact.
Detail/speed: These are fast and pretty detailed. I'd put them about on par with the Abyss here. The lack of detail is mainly a result of the FR issues I pointed out: bass overemphasis can put a veil on the music, and spacial information is lacking. They are quite clean sounding as well.
Soundstage/imaging: Not crazy about this aspect. Soundstage definitely has the 3 blob effect going with little portrayed in the areas between. Images are large vertically and a bit on the diffuse side. Soundstage on most tracks is a good size, but I haven't found them able to expand the soundstage out beyond the drivers. Then again, few headphones can do that well.
Overall a good headphone but I haven't made up my mind yet on whether to keep them or not. I like the clarity and convenience of these, but the FR needs improvement for them to stay. I think with a redesigned earpad these can actually sound a lot better. In stock form I wouldn't recommend these for the asking price to most people. If you like some extra bass in your music and pump these loud enough to not be effected by the lack of presence much then you should check them out, though. I had high hopes for this headphone and thought for sure I'd like them a lot. I think they have that potential, but as of now these are probably right outside my top 10 headphones.