Marantz VS3003 3 IN/1 OUT HDMI Switch - Value Electronics
Denon and Marantz will add HDMI 2.1 to these older receivers for $600
HDMI 2.1 adaptor brings three 4K 120Hz HDMI ports to latest Denon and Marantz AVRs | StereoNET Australia | Hi-Fi news and reviews
Denon & Marantz Announce HDMI 2.1 Receivers 4k/120Hz Works Without Issue! | Audioholics
Denon/Marantz SPK618 HDMI Adapter Test Does It Work? 2020 AVR HDMI 2.1 Xbox Series X Bug Fix! - YouTube
Marantz VS3003 - 3 In and 1 Out HDMI Switcher | Marantz - US
Report: latest AVRs from Sony, Denon / Marantz, Yamaha, etc. have a bug in the HDMI 2.1 chip - unable to pass through the 4k120hz HDR10 signal (german article) : r/xboxone
AV8805 HDMI 8K Upgrade - HDMI 2.1 Upgrade for AV8805 | Marantz - US
Marantz unveils its first receivers with HDMI 2.1 - FlatpanelsHD