This is so?
How have the audio in 5.1 or 7.1?
Assuming you have plugged HDMI cable into your Audio Video Receiver?
Look at the included "Quick Guide": Audio and Video Connections;
3. Connecting to Home Theater Receiver or Sound System (7.1 CH)
C: Go to Settings, Playback;
Set
HDMI Output RAW, SPDIF Output RAW, HBR Output RAW 7.1A good idea is for you to look at the excellent thread on the Kodi forum with lots of hard work by @hdmkv
http://forum.kodi.tv/showthread.php?tid=265888