DTS audio will not passthrough to receiver

Hello. I have an issue, DTS and ac3 audio will not properly passthrough to my capable receiver. no dts or DD symbol shows on my receiver. source may be dts, dts-hd or ac3. none work. tried probably every combination of settings in kodi. problem existed in previous version as well as current stable version of kodi. do not have this issue with mpc-hc, but kodi is better and syncing FPS to my display is simple (and a must). If I select ac3 transcoding, then the dolby digital symbol will show on my receiver for dts files. i want dts files to passthrough dts to my amp, obviously. my setup is…

Windows 10 Home
audio out= Asus xonar essence ST (coaxial)
video card= GTX580 (SLI)
1080p

?should kodi passthrough the dts core of a dts-hdma file down a coaxial cable?