BF4 Sound Fix (temp) post Mantle update
I found that if I change the sound type ingame under audio, from say hi-fi to wartime. Play the map completely through. All future maps have sound. If you log off our out of game ... you must do ...
Thanks for your information! I mark this topic as solved for better visibility here in Answer HQ. Could you do us a favor and jump in following sticky topic regarding the sound issue: http://answers.ea.com/t5/Battlefield-4/Information-Sound-issues-after-latest-PC-Jan-30-patch/td-p/2265483
Cheers
Basti