Problems with sound playing on PS4

Hey there, Im having an issue with sound in the game (on the ps4). When I play it on my HDTV the sound is excellent, but on my 27" Asus Monitor with Integrated Speakers I cannot hear helicopters and cars, but I can hear tanks. Can someone suggest a solution please? Thanks.

Huh, I have this problem from time to time on my HDTV. This game is just buggy as hell.