hey guys, i've been running the mini-X vs. my NFB6 for the last week or so on my HE500 and LCD2 rev2...
so far, for the HE500 the a100 is definitely a step down vs the nfb6 for every music mastered with lower volume.
why? i feel that my nfb6 (one of the first - not sure if new ones show this as well) only powers the HE500 beyond the 32 volume level. the amp seems to have very audible gain steps in certain volumes - and only beyond the vol 32, it seems to output enough power (in balanced output).
(IMO - the issue of the NFB is that the gain below the 32 is simply not enough to fully power the HE500 - regardless of volume)
this way, for every music that I can listen to above the 32 level, the nfb6 is significantly better - more neutral, laid back and with larger soundstage.
however, with more recent masterings (with higher volumes) that don't let me reach the 32 volume level, the mini-X is marginally better, as it outputs enough power at any volume level.
just my 2 cents... cheers!
Edited by szanella - 2/1/13 at 9:20pm