The volume of every phone is set to a standard rate and all the manufacturers are required to follow this law. They are not supposed to set the volume more than that level. This case is applicable for LG G2 also and the volume cannot be increased after a certain level. But there is a way that allows you to make music volume louder in LG G2 phone. This is discussed here.
See also- How to fix issues with LG G2 microphone
Way to make music volume louder in LG G2 phone
To make music volume louder in LG G2 phone you have to download an app from the Android market. The app is called Volume+ (Sound Boost). One more app is available in the android market which is a free version and this app is called Volume+ Free. You need to download and install the app in your LG G2 to enjoy the loud music but this app requires you to root the phone for this function to work properly. So you need to learn the rooting process also of LG G2.
Root your LG G2 phone
> First download the LG USB Driver from the internet and install it on your computer.
> Follow the path- System settings > General >About phone > Software information in your phone to get the ‘Build number’.
> Now enable ‘USB Debugging’ by going to Settings > General > Developer options from your phone.
> Connect the phone to the computer through USB and allow the drivers to install.
> Next download the rooting tools from the developer page and extract all the files in a folder in the computer’s hard disk.
> Double click on the root.bat file there and follow the prompts.
> Disconnect the phone from computer when prompted.
> Make the USB debugging off in your phone and connect it again.
> Strike ‘enter’ in the computer and wait for the rooting process to be completed.
Once your phone is rooted you can enjoy the music at the full sound through the Volume+ (sound boost) app.