If you look at the freq. resp. graph of E3, you'll know why I described it as less detail. You probably won't notice much if you are using a fairly detail headphone and not listening to it on a very serious manner. I can definitely tell the lost of treble on my Triple.fi 10, and it doesn't really work very well with my SE530 (synergy issue here). I'll say E3 works best w/ brighter sounding headphone. Headphone like EP-630 (which is already very warm and dark sounding) won't get much improvement from it.