New to the Battlefield 4 CTE is the audio obstruction system. This new system slightly tunes how you hear audio in Battlefield 4 depending on whether or not there is an obstruction or object between you and the origin of the sound.

Youtube user David Sirland put together a handy video that shows off this new system at work. In the video, white signals indicate that there is no obstruction between you and the sound origin. Red indicators signify that the sound is obstructed and modifies the sound accordingly. Obstructed sounds typically remove some of the higher frequencies and creates a more muffled sound effect.