I have wanted these headphones for a couple years now and thanks to a gift card from Best Buy, I was finally able to buy them. The thing is, I am starting to regret the purchase. I read that they were great with portables but that was a couple years ago. Any newer threads from 2012 and on, say that they need a amp if used with a iPhone. Can anybody clear this up for me? I don't really want to carry a amp around when i'm commuting to school and back.