Good morning companions, I turn to you, because I have a commax DR-nKM goalie front which has a fault, so that the user heard from the phone, the one on the street has to speak with his mouth almost attached to the microphone of the in front of the street, if you move away a little, you don't hear, it's as if you had lost sensitivity or amplification. The source ruled it out because I am testing it with another source and the failure continues. If you can give me a hand I thank you. Thank you

Hi. Microphones in microphones are usually dampened by simple use and begin to fail. You should replace it without first checking that the line does not have a short or a false contact. The problem is in just one device? regards