Is there a way to improve S6 audio quality? I just got a Samsung Galaxy S6 (Android 5.1.1) and I'm disappointed by the poor audio quality, as sounds are "chirping" and metallic, quite disagreeable to the ear. At first I thought it was just me, then I found several comments of people having the same opinion.

Is there a way to improve sound quality? For instance a built-in permanent equalizer, firmware updates, etc. ?
If you agree to void your warranty, your best bet would be to root your device and install a custom kernel, which can be further tweaked in order to improve the sound quality (amongst other things).