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Hi Symez, The RCA ports on the back of the EX9220 are for audio in, not out. The projector has a built-in speaker. You can use your iPhone to send images and video to the projector if you download the free Epson iPrint app and make sure your phone and the projector are both connected to the same 2.4GHz WiFi network. Regards, Mark - The Epson Team.
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