get ready for another noob thread (thanks in advance) I have a set of Sony MDR-XB700's. I've had them for about a year, and they already sound very crisp, but I've recently found out that I know next to nothing about headphones. I am looking for a portable amp that I will be able to use with both my iPhone 4S, and my MacBook Pro. I really tried hard to not start a new noob thread about this, but when I tried to find the answers on my own, I only got more confused. My searching led me to the Fiio E series, between E6, E10 and E11, but then I started finding some very technical, spec-related threads, and got lost. If I understood correctly, I believe one of those amps is not compatible with an iPhone. I just need quick help selecting a portable amp that I can use on both my computer and iPhone, and any necessary cables that I would need to make this happen. Please help me! Price range: somewhat flexible, but I'd obviously like to spend as little as possible, while still getting everything i need with good quality.