I am having the same issue with my apple tv. When it is mirroring on the board I have no sound. I also have the PRM-35 projector. I need to know what type of cable I need and where I need to connect. Do I go from the apple tv to the board? The apple tv only has the optical audio output. I have tried plugging external speakers into the ipad and using a bluetooth speaker and when those are connected I cannot mirror. Thank you.
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