Sound United fixes HDMI 2.1 bug affecting Denon and Marantz AV receivers
Playing TV Audio source to an AVR
Denon AVR-4520CI - Audio General Inc.
Denon AVR-X4700H 9.2-channel home theater receiver with Wi-Fi®, Bluetooth®, Apple AirPlay® 2, and Amazon Alexa compatibility at Crutchfield
Denon's HDMI 2.1 Receivers - Value Electronics
Denon AVR-4520CI - Audio General Inc.
Denon and Marantz will add HDMI 2.1 to these older receivers for $600 | Engadget
Denon AVR-X4500H Receiver 8 HDMI In /3 Out, 9.2 Channel 125 W/Ch | Dolby Surround Sound, Music Streaming + HEOS Black AVRX4500H - Best Buy
Amazon.com: Denon AVR-1913 7.1 Channel 3D Pass Through and Networking Home Theater AV Receiver with AirPlay (Discontinued by Manufacturer) : Electronics
HDMI/SPDIF Separation and Passthrough to Denon AVR - Vero 4K / Vero 4K + - OSMC Forums