Thanks dude good to know, a lot of the research I did before purchasing stated that to drive them a portable amp is recommended. I figured I would give them a listen as is and then do a little research on an amp after buying. I plugged them into my fiio X1 and to my ears (previously some fiio EX1 iems) they sounded great. Also an Iphone 6s plus and LG G5 drove them to adequate listening levels. Am i missing anything in regards to sound quality without a amp?