If I use my TV's optical port, everything works as intended. If I use the optical port on the ZX9 eveything works except for dts. I really want to use the port on the Z9X though. My DAC-AMP Combo supports Dolby Audio, so I set my TV Optical to Dolby Digital, and it plays whatever gets thrown at it. With the Z9X I think I've tried every setting and combo to get sound in the dts audio tracks, but nothing works.