In Origin - Application settings - Origin in Game - disable Origin in game Then go to compatibility tab and check the box next to RUN AS ADMIN. Go to C:\Program Files (x86)\Origin and right click on Origin.exe and go to properties. Right click it and go to PROPERTIES, then COMPATIBILITY and check the box next to RUN THIS PROGRAM AS ADMINISTRATOR. Go to the Origin games folder (C:\Program Files (x86)\Origin Games\Battlefield 4) and find Bf4.exe. Do driver updates :} But it sounds like you did most if not all of this already so something could be mucked up in game cfg so do this group of settings and then do last part reg cfg
Also check in game and PC sound settings. Ok check all connections on PC headphones speakers what ever you use.