Default Low Mic Gain

Hello all
My Optimus G has very low mic gain on voice calls and it's a real pain to shout everytime for a normal talk . If i don't shout other party can't hear me. I've searched many threads and i am amazed no one has posted any workable solution . This problem is reported by many users . Many prople have recommended noise reduction function as a culprit and it should be switched off but i did not dind anyway to switch it off in settings . If someone knows the solution please come up . Thanks .

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