3) Playing digital optical input - Good choice
A digital optical cable connection from the television also provides excellent sound.
Connect your television with an optical output to the OPTICAL IN on your HEOS HomeCinema using the included Digital Optical cable.
Select “TV” from the music tab.
Select the name of the HEOS HomeCinema to which you connected the television in step 1.
The sound from your television can be played directly on the HEOS HomeCinema.
The optical connector looks square, but it is “keyed” and will only plug in one way; don't force it.