It’s coming out of FCPX as discreet channels it is not encoded in Dolby so if you go optical out to a receiver, the receiver is not going to know what to do with the audio channels because it is not properly encoded in a way it is expecting to be– Dolby Digital or DTS.
You have to map each output from the Mac to a discreet powered speaker. You need hardware to do this. A Kona Card or Blackmagic card supports AES/EBU audio with each channel supporting a stereo pair. This get sent for me, to my Tascam DS-M71 and then routed out to the proper speaker.
How you do this depends on how you output audio from your Mac. You can go optical out to a device that accepts TOSLINK and properly map the channels. You just need the proper hardware to receive the Toslink audio.
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