Saw cables like this on Amazon. There are some which takes usb power like the 2nd link. HDMI to RCA Cable, HDMI to RCA Converte,1080P 5ft/1.5m HDMI Male to 3-RCA Video Audio AV Cable Connector ...

In reviewing many product pages, I found a single ~$70 HDMI switch w/ RCA audio out that *claimed* to do what I wanted but was from a no-name brand on a no-name website; this was sketchy enough ...

Both HDMI and optical pass digital audio from one device to another. Both are better than analog (the red and white cables). Both can pass multi-channel audio, like Dolby Digital .

Any HDMI cable should be able to cope with the requirements – it’s only when we move on to eARC that this could (potentially) become an issue. But more on that later. As part of the process, you ...