so far the things that I have read on these forums that work well to make it louder are:
1) Turn on Dynamic normalizer in the sound settings
2) Go into sound enhancements and set all the equalizer sliders to 10
3) Proceed to the "settings" next to the equalizer and turn on xLoud and (personal taste) turn on S-force Surround
Clear phase lowers the volume although it does make it cleaner.