Improve Bluetooth Audio on Android mobiles

Improve Bluetooth Audio on Android mobiles by using this single modification.

Requirements: 
Root permission.
Root Explorer or similar.

Goto: /system/etc/bluetooth
Open audio.conf
Find line: SBCQuality=MEDIUM
Change it to: SBCQuality=HIGH
Reboot.

Alternatively,
download and install https://play.google.com/store/apps/details?id=com.noozxoidelabs.eizo.rewirepro