“I have a 12’ Rocketfish HDMI 2.1 cable in-wall that is currently connected to HDMI keystone wall plates, which is experiencing signal loss and unable to use my Xbox Series X 120hz feature because of it. Do these support HDMI 2.1 4K 120hz w/o signal loss?”
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No, this coupler does not support HDMI 2.1. This device supports all HDMI 1.3 features.
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