Made my friend get the new E series and it had like have as much and he was disappointed that I hyped it up and returned it. I have a S series and it went from 0-3 and 2 was pretty big bass 3 was strait crazy. Fiio's 2-10 just gets muddy by 6, it ups to much mid-bass and not enough 40-80hz punch.
So many more headphones can be basshead headphones/happy happy fun time with a bass boost.
PS iPod and Galaxy Phone eq's make every thing sound horrid.