the headset you are wearing with the ECH Helmet or the Rangemaster cap.
have a sound reduction and a sound amplifier feature.

that means if the outside volume is under, i don't know lets say 120 dB the sound will be amplified so that the environment sound will be loud. and if the sound exceeds 120 dB it will reduce the output in the headset so that no damage will be made to the soldiers hearing.

this should be a feature while using those headset, so that when i ride the little bird i don't get my brain thrown out the other ear cuz the sound i so freaking load that i can't hear the communication. when i shoot, the sound will get reduced. but if the sound is okay i will be able to hear more clearly what is going on in my area. i will be able to hear the rabits jump in the grass, or the snake moving in the dust.

i know this because i have a pair my self. {F19953}