BassDigger
500+ Head-Fier
I've used a number of amps with these cans. Polaris, Ember, Ember II, BHA-1, HK3490, Onkyo, SONY, Pioneer, etc...
I have now found that feeding this headphone with crazy watts does it wonders. I'm running it off a Maggie 8802 amp off the speaker taps which provide 12 watts per channel via a HiFiMan HE adapter and the LCD-2f is a whole new beast. Damn.
I'm not (yet) planning on getting a 12watt amp. But, I am 'saving' (read 'softening up the wife') for a Krell klone, which is supposed to have about 8 watts output.
It's always interesting to read about the effects of 'excess' power; especially when there are those who quote sensitivity and power equations, and insist that a nanowatt (or something like that) is more than ample.