From here on out I'll refer to these as the m-V6. The m-V6 have a wonderful lushness to the lower and median mids, inoffensive controlled upper mids that are still a bit forward and provide bite, but are naturally wet, (no disgusting Sahara Desert effect here) and bass that lays a proper foundation for the music. They behave like chameleons in quite a few ways, especially bass quantity, transparent to the source (song) you're asking them to do. Most importantly however, they have a roundness to the lower and median midrange's sound, things seem to step forward near the center and recess as they near their sonic boundaries. (not necessarily in space, though) It's a very strange, euphonic experience, and I'm in love with it, I can only hope this is the merest taste, and the TH900 and HE90 provide this to its fullest extent, throughout the entire range. The controversial part, now: the m-V6 is very technically capable, it doesn't smooth over anything, and its attack and decay keep pace with more expensive fare. It's just as good as the HD600 in this regard.
Now, of course these are not without their faults, not by a long shot. The m-V6 still has a dip in its median midrange, which is inoffensive to me, but other people may really not like it. To me, having a dip in the lower mids is what creates a nasty suckout that leaves the headphone sounding bone-dry and unnatural as all get out. The m-V6 is also missing extension above about 14kHz and below 80Hz or so. EQing the treble up really helps them with their already excellent sense of space and air. Their soundstage is average, but imaging is pretty good, giving them a nice dimensionality. There's plenty of things I wish I could change about the m-V6, but for now they remain the most satisfying, musically engaging headphone I own. I can really just forget I'm listening to headphones so easily with these. (I feel I have to say this: I am not you, don't go running out to get a pair and mod them because I love them, chances are you will not like them, my sensibilities deviate from standard audiophile sensibilities at almost every turn.) I feel I should mention too, my V6s are new production.
