So today I bought a new pair of headphone. Nothing special just a pair of budget ones (Sennheiser CX 300 ii). I used them first on my iPhone 6 + and then on my macbook. It was like night and day the difference. Now obviously the macbook will have a better soundcard than the iphone but I think the iphone should perform better. I read when the iPhone was just about to be released that it apparently lacked HD audio or something like that. Is that something they could add in?