Apple Lossless-same lossless like flac but for ipod/iphones. You can start by ripping one of your cd's to apple lossless. You need to go into itunes and change your importing preferences. You can download some music apple lossless but easier to find flac and then convert it with a conversion program like xACT or XLD. One advantage of an amp is it uses the better line out of the iphone from the dock at the bottom, but for that you also would need a line out dock cable from the doc to the amp.
Anyway, use them for a week or two and then go back to your old iems and see what you think.
FYI i use a Highfiman HM-801 with the game amp installed which is for iems. When i use an ipod i use the Fostex HP-P1 with it's built in amp. Been a while since i was even using the doc out but it made a noticeable difference to me.
Good Luck with it.
Edited by dallan - 7/17/12 at 3:25pm