If you’re an LG G3 owner and are not quite happy with the speakers, you may be interested in a tutorial written by XDA Senior Member spiderio. The tutorial teaches you how to boost the volume of the headphone and speakers on the G3, and involves a few changes to a couple xml files. As it’s not a standalone mod, you’re allowed the flexibility of setting your own volume limits, which may be different from person to person. And as always, make sure you make a backup of the original files in case you may want to revert the changes in the future.
If you would like to give this a go, head over to the Volume Tutorial Thread .