Sound / Loudness level decreased after .189/.191 Update

[lovin2501]

There's substantial drop in loudness level via inbuilt - speaker  & earphones as well . Please check.

[dineshlalwani10]

Yes mods, please help. Can't hear anything on call unless i am in a silent room.. 

[ZT-f092f57a]

Yes indeed. Earpiece loudness has gone down drastically..

[ZT-f092f57a]

Just not able to hear when in noisy place like public transport.. it was working fine in update before 189

[Aryan202]

It was reduced for a reason to provide better stereo effect
On previous firmware the bottom speaker was much more louder than the earpiece speaker 
They did the same with 5z
Don't worry with the next couple of updates they'll increase the output and stereo effect again