“Do the rear speakers work with optical audio? I tried with my Xbox one x and it won’t work and it won’t allow 4K with the hdmi ARC”
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The wireless receiver that the rear speakers for the LG 4.1-Channel Hi-Res Soundbar System with Wireless Subwoofer and Digital Amplifier, Model # SJ4R plug into receives its audio signal via Bluetooth from Soundbar so regardless of whether you are using HDMI or Optical Digital Audio, the audio will be transferred via Bluetooth to receiver and played through the rear speakers. The wireless receiver and Soundbar should automatically pair when they are first turned on. You can pair them manually if they do not connect automatically as instructed in the owner's manual. HDMI OUT (TV ARC) jack is for TV connection. Even though multi channel is input to the unit through an HDMI cable, the unit can only output PCM 2 channel to the TV. Both the HDMI Out (TV ARC) and the HDMI IN are HDMI 1.4 ports that are HDCP compliant, they are not HDCP 2.2 compliant and they will not pass a 4K signal if your gaming console is HDCP 2.2 compliant and has HDMI 2.0 ports...^IFV
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