>>1694210One is the string slapping the bow as it launches the arrow. The other is the vibration of the string as it returns to the undrawn posotion. You can can string silencers to mitigate some of the noise but don't get deluded into thinking you can make some kind of Skyrim stealth archer meme. The string silencers are more for reducing ear damage as you practice shooting a few hundred shots a day.