Hello, I've got a Yamaha RX-475 receiver which supports 4K but does not support HDR..... I believe! Now I've done a work around by plugging in the Apple TV (old one) direct into my T.V (Samsung k8000) via HDMI and used an optical cable to use the audio with the AV receiver. When I watched the Apple presentation it looked like 4K and HDR can be combined, is this correct or have I got my wires crossed. I'm just wondering if I've just done a lot of faffing around with my receiver for nothing.