Thermal Performance
As I have been commenting, these Denon/Marantz AVRs run pretty warm. So I thought I take a snapshot after my testing using my IR camera:
As we see the hottest area is the row of heatsinks. Zooming in we get the peak temperature:
As we see the peak temperature is 72 degree C (161 F) and this is the heatsink. The junction temperature for the power output transistors will be much higher. And this is with the AVR in "open air" and not in any kind of cabinet. So be careful about amount of airflow.