With android and especially Mediatek everything is possible. Just like the changing of your phones IMEI, this is possible as well.So hop on and lets go for this ride.
How to increase the audio quality of your Mediatek Phone.
Download mobile Uncle tools from playstore or get the English version Here. It needs root access, so make sure your phone is rooted.
Install the Above downloaded application and open it
Click on Engineer Mode
Click on Engineer Mode (MTK)
Swap to Hardware testing
Click on Audio.
Click on Loudspeaker Mode
Input the Values between 148-150 (Highly Recommended)
Click on Set.
You will this message if it was successfully done.
Exit Mobile uncle tools and feel the increase in your Volume.
NOTE: The highest you can set your loudspeaker is 160 which is not advisable because it can easily damage your phone.