I bought the 75Q900R but unfortunately I don't have any other device with eARC at the moment. I was also planning on buying the Sonos Arc in a couple of days. Supposedly the HDMI 4 on the tv supports HDMI 2.1 (while HDMI 3 is standard ARC), according to rtings. Can any of you confirm this? Does connecting your Sonos Arc to HDMI 4 instead of HDMI 3 change anything?
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