Galaxy S6 :: Increase Volume On Stock

At certain times, for example at the gym or a crowded bus, where there are a lot of loud sounds around you, the maximum media volume is not enough for me. I used to have Note 2 with the same problem, but I just rooted it and modified sound config file, but I really want to avoid rooting S6, since its a superior phone and i dont need any benefits root might offer.

So is there a way to increase maximum heaphone volume, without rooting your phone? I am using medium-range sony earbuds, hated the new Apple like S6 stock ones (by the way, what do you think of them?), and atm I dont have spare cash for a new model, so replacing the earbuds is out of the question. If not, what is the least-system-modifying root and sound mod? I want to stay as close to stock as possible.