I changed these 5 settings on my Android phone to instantly boost the audio quality
Briefly

Bluetooth signals reduce sound fidelity and can introduce noise; opt for wired headphones for higher-quality sound, like Marshall Major IVs for both Bluetooth and wired connections.
Disabling Absolute Volume for Bluetooth on Android can improve sound clarity, especially when using bone-conducting headphones, but caution is advised to prevent sound distortion or potential ear damage.
Read at ZDNET
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