While I had the HP100 I noticed a lack of body in certain songs. After fiddling with the EQ I managed to "fix" this by increasing the 125Hz and 250Hz bands a few steps (I think it was 4 and 3 steps). However, by doing this I noticed the gorgeous sub-bass fade away unfavourably.
So the dumb question: Is this because of a lack of proper amping? (I was powering the headphones straight from a smartphone). A potentially poor DAC? (Again, smartphone). Or because that's just how sound, frequencies and, thus, EQs work?