3) Playing digital optical input - Good choice
A optical cable connection from the television also provides excellent sound.
Connect your television with an optical output to the OPTICAL IN on your DHT-S516H using the included Optical cable.
Select “TV” from the music tab.
Select the name of the DHT-S516H to which you connected the television in step 1.
The sound from your television can be played directly on the DHT-S516H.
The optical connector looks square, but it is “keyed” and will only plug in one way; don't force it.