My phone don't use speakers to the maximum of its possibilities I've a Xiaomi Redmi 3 Pro.

I've a problem with its speakers. When I put the maximum volume and I put the phone close to the hear, I found that my phone uses only half speaker to share the music(or every type of audio). 

Is this a bond I can unlock in my audio settings or is this a problem that the phone has took from outside?
If you disassemble the device, you will see that, despite the outer shell reserved a wide opening for sound output, the actual speaker unit is quite small and biased to one side. This will produce the effect you observed.



You might be expecting a large speaker, or 2 separate speakers filling the whole opening, which simply can't be the case for lower-end devices.