The LCD3's sensitive with amplification? Yes but not by a lot compared to its older brother. I wouldn't exactly agree the LCD2's playing nice with basically everything either and the LCD2 rev.1's are little less forgiving with amplification than the rev.2's. For example, on most tube amp's I've tried, DIY or even popular off-shelf stuff from Woo, Darkvoice amp's etc, the LCD2's just don't sound as good when fed with good clean neutral or bright but powerful solid state power. The LCD2's and 3's I can also say is one headphone that you don't want anything such as an amp too coloured sounding as this seriously bloats up the sound from these headphones, you want an amp with plenty of power to deliver clean power, amplifying the strong points of headphone itself, the LCD2's and 3's without reference to FR graphs and CSD plots are anything but neutral, some aspects of the sound is neutral this I agree, but it is far from being completely neutral and this includes the infamous Audeze bass response as well.
Regardless of both, none of the two mentioned headphones require finicky amplification that the HD800's do.
For $5.5k you should be damned impressed at this price-point and there is no excuse for this whatsoever. Judging from what I've read and seen, these are good but not $5.5k good. That crown belongs to the SR-009.
Well I'm hearing everything from they are better than the 009, they cannot run with the 800's they are better than the LCD's, they are not on par with the LCD's. So when all is said and done there is so much conflicting information that in essence there is no information at all.
It would seem it's every man for himself here, and this man chooses to keep the 5.5 grand in the bank.