This is very preliminary thinking. I am considering an OLED 4K purchase maybe in another year. Currently I have a Panasonic 50" Plasma which still looks great. My sound system uses a Yamaha HTR-3066 amplifier which is five or six years old. At the time it said it would pass an HDMI signal which could handle 4K. In the manual is lists the highest compatible resolution as 576/50Hz, 4K/ 30Hz, 25 Hz, 24Hz. As my little system is currently set up my blu ray player passes its signal via HDMI to the amplifier and then back out to the TV, also by HDMI. I have it set up this way to take advantage of the better quality blu ray soundtracks such as Dolby True HD and DTS-HD Master Audio which require an HDMI connection. However, assuming that I bought a 4K display as well as a UHD player, I am wondering if this could pass the full UHD signal which includes wider color gamuts and things like HDR and Dolby Vision? Since I live in a small condo, making an upgrade to something like ATMOS is not in the cards---my neighbors would riot. However I think 5.1, similar to what I have now, would be fine. I see the following alternatives if the amp could not pass the better quality video signal: 1. Buy a new amp which could pass the full UHD signal and use the 5.1 existing speaker system. 2. Use some kind of HMDI splitter to send the audio signal from the UHD player to the amp and the video signal to the tv (which might degrade the signal). 3. In my experience none of the tvs I have had can take a digital audio signal and pass it back out to the amplifier in its original format. What I have seen is a full 5.1 signal goes in and a folded down 2 channel signal comes back out of the tv. And so far I do not see any tv which has an HDMI output which would be required to keep the sound in its best format. Any information or opinions would be welcome. As I said I love my Panasonic Plasma and once it is gone I will have to give up 3-D which this display does quite well. So this change to 4K is not eminent. Thanks in advance and I hope I posted this in the correct forum.