how to connect echo dot to sony surround sound blue ray player via bluethooth?

Does the Sony not have an input you can use for the Dot? If it only has one that is already in use you can add an audio input selector to expand it.
Does the Sony have a bluetooth receiver built in? If not then no you can't.
You can connect a BT transmitter to the audio output of the Dot?
 


sony has bt so does dot but don't connect?
 

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