People with crestron/amx etc automation systems in their house need components with rs232 ports to control them. It allows the automation system to know if the component is on, which input it's on, etc. Denon and other high-end brands have these which makes them a favorite for high-end custom installers.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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People with crestron/amx etc automation systems in their house need components with rs232 ports to control them. It allows the automation system to know if the component is on, which input it's on, etc. Denon and other high-end brands have these which makes them a favorite for high-end custom installers.