So I own Sennheiser HD380 and even though it's only 52 Ohm and I think about 110 db sensitivity, I am happy with the sound. It's loud enough. I use mostly iPhone5 as source.
Now ... people that buy FiiO E12, Fiio E10 and other small AMPs just rave about how they 32-52 ohm headphones started sounding so much better once run through an amp.
Is it true or are they imagining things that are not there?