Thank you for bringing this thread to my attention, and for linking my video in!
I am using the Fc8 V2 in my traditional Voigt pipe cabinet (close to Paul Voigt's original, with cabinet volume adjusted to Fostex Fe204 Vas), and have about 7 hours of break in so far.
My observations are right on with @mikeg 's observations (post above, his 75hr break in report):
*Superb center fill
*Complete lack of directionality, sweet spot opened up (after 15min break in): image stays 3D in the entire room, I can sit / stand, move to the side, move between speakers - 3D integrity stays. Ear does not get cues about the actual place where the speakers / drivers are.
*Superb low end extension. First hour of break in bass was loose (yet extended), and it started tightening up, cleaning up. Level is lower as of now than mids & highs, but getting louder (catching up to mids) noticeably as break in progresses.
*They do not seem to mind silver. Using copper IC and speaker wire, but amp is fully silver wired internally and speaker cable has silver terminals.
*They do not need a sub. They reach very deep (my Voigt pipe cabinet has the ability to convey to 30Hz in my room). Church organ rendered beautifully. The low bass is better integrated and cleaner than a sub could render it, even when the sub goes lower than 30Hz. I agree, sub takes away from FR bass quality and integrity.
*They are getting louder as they break in. I think the spider has to break in mechanically, so it can allow the cone to move freely. As the spider is quite strong (not the usual soft material), this break in is expected, and should be pronounced. In the first hour louder passages were compressed and got a little confused, but this is disappearing with break in, and they can play louder and louder. Mind it, I'm still under 10hrs of break in...
*Softer / mid volume parts are all beautiful, exquisite 3D rendering. Precise, holographic, yet NOT FORCED nor FAKE. With most hi-rez multi-way speakers I get the impression that something's not right with their hi-rez rendering. Here, I'm not getting that feeling, the presented space is natural and comfortable.
*The sound is very much energized, with excellent, very precise HF reproduction. Yet, it's not fatiguing! HF and air without distortion, which is a feat I heard only from the best compression drivers.
*Whizzer cone: whizzer cone artifacts typical to FR drivers are missing. No "Lowther shout" whatsoever.
*I was worried about the magnet material being Neo / ferrite and not Alnico. My worries are gone, the motor was implemented superbly. The tone is the opposite of Alnico drivers, but that's something I welcome. (I have a bunch of Alnicos, varietas delectat, I was actually looking for the complementary flavor!)
These are my initial impressions...
Janos