My Dad just bought the game and started the campaign. In the opening scene, there is no audio for dialogue. We have yet to progress further through the game to see if the issue persists. We have tried messing with all the options settings. It seems there are some other people posting about the same issue on other forums. Please respond if you can help out or if you are also experiencing this so we can bump this thread and Treyarch will notice if they don't already know about the issue.
I tried removing the patch 1.02 and deleting the profile save data. The issue still persists. This bug seems to have shipped with the disc. I guess all we can do is wait for another patch...
For everyone out there thats having problems with the sound on Black Ops 2 using hdmi i have a simple fix for the sound issues if you go to your display setings in your ps3 and use the avi that normily comes with the ps3 and setting that as your video and audio on the ps3 this will fix the issues with the sound did this myself and worked minute i loaded the game sound works HAPPY PLAYING