Me auto-cito:
"DTS-HD Master Audio and Dolby TrueHD, ATMOS passthrough is not currently supported on Kodi 15.2 or 16.0 It is a feature that is being worked on and will come in a future version of Kodi. HD audio passthrough is supported only on native video player and other apps like MX player.
If you install Kodi 16.0 alpha, you can enable decoding of DTS-HD Master Audio and output it as 7.1 LPCM. However, this will not work for ATMOS. You can get object-based audio only with bitstream."
P.d.: He leído que KODI 17 (o como lo vayan a llamar cuando deje de ser alpha-beta la versión 16 ...), saldrá a principios de 2016 y ya soportará decoding de DTS MASTER AUDIO, y ATMOS y vete tu a saber si tb DTS-X.
Saludos