Why can't any one hear me through the life proof iphone 4s case?

I have a life proof case for a while now and it it starting to get annoying that every time i'm talking to some one on the iPhone that they can't hear me. For them to hear me i have to open the charger flap from under the case then cup my hand around it for them to hear me. Is this normal for the case or some thing is wrong with the case?

Duhh, it's life proof, meaning that nothing will get thru unless you make your first kill using it!

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