There isn't one. At least not for mere mortals or even most HiFi nerds. I've got $300 headphones I use with my iPhone. They sound exceptionally better (especia

There isn't one. At least not for mere mortals or even most HiFi nerds. I've got $300 headphones I use with my iPhone. They sound exceptionally better (especially with an amp) than shit earbuds it comes with. Even if Apple traded the analog for a digital connection, I'm pretty certain I wouldn't notice a meaningful difference in day to day use. Now I'm sure if I sat down with the express goal of proving they're different I could convince myself they are but I doubt it.