It bugged me that the volume produced by default was considerably lower than most of my other devices (especially when using headphones). I tried out all the different equalizer apps to get some good sound but none of them seem to work on KK. ViPER works GREAT! It was built into a few ROMs I've used in the past, but I didn't realize it could just be downloaded and installed as a standalone.
So in case you're not getting the volume output you want, go ahead and use ViPER. http://vipersaudio.com/blog/?page_id=25
I've got it on the lowest boost settings and it really improved things.
Acer Iconia A700 CM11
Samsung Galaxy Note Pro 12.2 Stock (for now...)
HTC One X Team Venom ViperXL