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This output would carry an optical audio signal to a receiver. I would assume that one might use this option if you have your video source near the projector and want to make a digital audio run to a receiver placed in another part of the room. Like most newer TVs, this allows you to run one optical audio signal out of the projector if you choose to run your video sources directly into it. Just keep in mind that optical audio only carries two channels and you would need a receiver to run the processing (Dolby/DTS) for 5.1 surround sound. I run my hdmi sources into my receiver and then run one hdmi output to the projector. My receiver is HDCP 2.2 capable, however.
Sorry, there was a problem. Please try again later.I think I remember reading that the SPDIF port only works with HDMI Port 1 and not HDMI Port 2. HDMI Port 2 does support ARC but does not support simultaneous use with SPDIF. HDMI port 1 does support 4K but not at 60hz. You won't get HDR either through HDMI port 1.
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