The back of the Marantz is a thing of beauty. Sporting seven HDMI inputs at the back and 3 HDMI outputs. I finally have the flexibility of perhaps doing a proper multi-room setup should I have the need to do so in the future.
The USB power supply is a rather nice touch. I can use that to power a small fan if necessary to cool the unit. Or power a future Snakeoil OS running on a Raspberry Pi.
The back looks really really good. The Marantz engineers have placed some emphasis on getting this right. Curiously the component inputs is spaced pretty far from the analogue inputs. This is a problem for my Nintendo Wii so it looks like I either have to find new extension cables for the Wii, or retire it from my home theatre and get something newer (Switch?!)
All XLR connectors are 2-hot. So far I did not see any way to switch the polarity (it could be hidden in the menus). If you are considering getting or already using XLR power amplifiers, make sure you set the amps to 2-hot.
Audyssey will complain if your speakers are wired out of phase.