Now I linked to two mods that clear up the sound, and one that loud-ens volume, but the volume cant be raised extremely high since these boomsound speakers arent made for that. They do have a limit. Check out thread #3 for the volume loudness.
Viper4android. Not only does it do speakers it does head-phones too. It affects all sounds from the phone. So calls, videos, games, and obviously straight up music. Its super easy to use and you just tweak it as you want. http://forum.xda-developers.com/show....php?t=2191223
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