Laura has a 17x20 living room with a 10-year-old TV that she wants to replace. What size should she get? She's looking at the Samsung QLED QN65Q. Will her speakers be plug-in-play to support them? Leo says yes. Whatever sources they have in the receiver will be supported. She just wants to be sure to plug the HDMI cable into the port that says "ARC." That's the Audio Return Channel, and it'll keep the audio in sync. If the TV doesn't support ARC, then she needs to opt for the optical connection, and some TVs are dropping that. If that's the case, she may need a new AVR.
But if she doesn't, then the TV will be 4K though, and depending on how old the AV receiver is, it may not support the 4k video signal. But that's really only for peripherals like a DVD player, and they don't support 4K anyway. What about cable or satellite boxes? Leo says that isn't 4K either. So she should be fine, simply swap the TVs out!