I don't know much about amp and headphones and that sort of thing... I am trying to set up a system where I can hear the lower tones of music I am trying to listen to (mostly classical is the problem). I am listening off an iphone 5, and will probably be getting the Sennheiser Momentum's. Do you have any recommendations for a portable amp? I would like something that I can use to turn up the bass so I can hear it, without having to turn up the overall volume. I don't know if that is possible though. Also, is there an app for the iphone where you can do something similar? Any suggestions would be great! Thanks!
P.S. I am looking to spend around a hundred bucks or so.