Thanks for your promt reply👍. I do have the DRX connected properly and to the main eArc HDMI on the tv. The Xfinity cable box works fine and we get sound from the av. no sound in any of the apps, eg You Tube, Apple TV, etc. We don’t have a dvd hooked up. If I turn off the receiver the sound defaults to the tv for the apps. I have selected hdmi ARC for sound in the tv settings. Love the tv.