Rev1 is different from rev2... Rev2 have more apparent treble and better measurements (the difference especially in measurements is apparent, they measure better than HE-6 as I already assessed, you can check my comments here regarding their pdf files on innerfidelity).
As a very important bonus for me, I can power LCD-2 rev2 with my O2 on 1x gain = absolutely no distortion. The result is amazing, another person told me that today with Pink floyd. ,-)
Edited by MHOE - 11/24/12 at 5:48pm