Wow, ok. So my E11 arrived. I hooked every thing up to my iPod classic and began listening to some of my higher quality ALAC albums, and the difference was astounding. The bass was super tight and controlled, mids had more strength, and highs were clear. I've spend the good portion of the...

Hi folks,    I've been reading the forums for quite a long time, and just now I am making my first post.   My question should hopefully be simple.  What am I listening for when trying to find the difference in quality between using a headphone amp and not using one?     The...