Weak mic with modmic

Hi everyone, since a long time my friend told me that they don't hear me really well, and now I want to find a way to fix it.
my config :
Platform : Play on Xbox One
Mixamp : Mixamp 2014 edition (grey with with line)
Headset : Beyerdynamic dt 770 80Ohm
Mic : ModMic from Antlion.

I thought that was a really good configuration but my Microphone is weak, I think because of the mixamp power is too low.

Is there anybody knows what we can do ? maybe use an amplificator or...

Weak mic with modmic