Why do both my Apple TV appear in iTunes preferences MAC

I have a 3rd generation Apple TV in my family room. and a 4th generation Apple TV in the games room.  They have separate names. The 3rd generation Apple TV shows only in iTunes preferences on my Mac.  However, if I play music on my MAC, and I want to use multiple speakers Apple TV display and I can listen to music on two of them.  I wonder why my 4th generation Apple TV doesn't appear in iTunes preferences on my MAC?

My MAC running OS X El Capitan, V 10.11.5; two software Apple TV is updated.

4th gen ATV does not appear as a device in iTunes. That is how it is designed.

Tags: iTunes

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