Original app thread :- Xperia Z2 WALKMAN™ | The Best Clear Audio Experience
Download and flash it and notice the difference yourself..
P.S. :- No need to do any equalizer settings, just select Clear Audio + and you will get the best audio quality
1. As with any other mod, flashing this also carries a risk of soft-bricking your device (though it worked for me), so make a backup first before proceeding. I hold no responsibility and you yourself will be responsible if you brick your device by flashing this mod.
2. Download and flash the latest version of Xperia Z2 Walkman, New Xperia Z2 WALKMAN build.prop tweak & WALKMAN Visualizer for KK 4.4.2 zip one after another. The build.prop zip doesn't replace the build.prop but just adds some lines to your existing build.prop for this mod to work.
3. All credit goes to the original developer, I am just sharing the awesome mod with the G2 community. So be sure to hit Thanks button to the developers post.
4. If you are using any other mod like Viper or DSP, be sure to disable those before using this.