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can a hdmi spltter be used to split input to sonos arc from either tv or projecter

Can you please eleborate on your use case?

For example: TV HDMI-ARC split to projector and Sonos Arc will not work because only sound will leave the TV with HDMI-ARC (that is considered an “in” for images and sound, but an “out” only for sound, whence Audio Return Channel -  ARC).