From the Siege main menu, click Settings.To be able to maximize the potential of Night Mode, I recommend using a good 7.1 headsets with it, as well as spatial sound.
Almost every action in Siege makes sounds, and Night Mode will detect them better than the other dynamic range choices. Meaning the small sounds that small actions make, like switching stances or leaning and peaking. What’s really great about Night Mode is that it enables players to detect quiet sounds better. Meaning, with Night Mode, the player will be able to hear sounds further compared to the other dynamic range choices. Night mode does reduce the audio quality of the game, but what it provides players with is a wider and more detailed dynamic range. Night Mode is the most popular dynamic range settings for Siege players because it provides the most practical audio experience for Siege’s competitive gameplay.