A:AnswerYou probably need to adjust the sound settings on the TV to tell it to output sound to external amp (either optical or HDMI return, depending on your setup).
A:AnswerHow did you get this receiver to work with Alexa, I try to scan with Alexa with my phone and it does not find it so very curious how you got it to work with Alexa?
A:AnswerI have my Arius (Comcast) DVR connected through this receiver, and it works fine. I can't think of a reason why it wouldn't work. My DVR is 4K and HDR and the Onkyo passes the audio and video through with no issues. Good luck!
A:Answeradvanced manual indicates listening modes for headphones as mono, direct, stereo. Pure audio available on European, Australian and Asian models