I have tried all the suggestions here and the sound still does not work when streaming. Some days it will work, and other times I can get it to work by restarting etc, but it's a very poor product that needs endless tweaks to do what it's supposed to.
I have restarted. I have checked cables. My TV is connected directly to the AppleTV box with an HDMI cable. I have adjusted settings of Dolby and audio to 16 bit, as suggested. I have restarted my internet. The TV is beside the wifi box. What else can I do?
AppleTV 2, OS X Mavericks (10.9.1), MacBook Pro