no audio when in raw out mode

[Spinekar]

hi guys, i have a kaiboer h1055 plus when i set the audio to raw output and take it out using co-axial cable to my AVR i don't get any output but when i change it to lcpm i get audio but no dd or dts ....... am confused, is it an issue with the kaiboer or my AVR ( sherwood RD6502)