I have a Denon AVR 1603 which is probably 12 years old.
It has 2 Optical In and 1 Optical Out. It also has Coaxial In.
At present the 2 Optical In ports are used by:
Panasonic Plasma (not smart) TV
Panasonic BluRay Recorder (Smart but useless in the real world)
I have just purchased an Amazon FireTV Media Streamer which has an Optical audio Port.
I don't know what an Optical Out does and I did look at the manual.
Can I connect all 3 devices (TV, BluRay and FireTV)? Somehow?