Let me clarify something about the 3c headphones that I preferred over the 3f. The 3c is also a fazor model. I did not buy the very earliest LCD-3 non-fazor build that start with 231 serial numbers. What I preferred is the previous generation fazor LCD-3 version starting with 261 serial number. Please see this post by jonstatt for more details about the *three* different versions of the LCD-3.
I simply preferred the earlier fazor variety and have actually never heard the non-fazor version of the LCD-3.