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The inputs on the LG 43 inch Class 4K Smart UHD TV w/AI ThinQ® (42.5'' Diag), Model # 43UM7300PUA are 3 x HDMI inputs, 2 x USB ports, an Ethernet port and a Shared Composite/Component Video Input with the associated L/R Stereo RCA Audio ports. Depending on which LG Soundbar you are looking to hook up, it can be hooked up in one of three ways. The TV supports Bluetooth (ver. 5.0) so if the Soundbar also supports Bluetooth, you can pair it with the TV to stream audio wirelessly via Bluetooth. The TV has an Optical Digital Audio Out that can be connected to the Optical Digital Audio In on a Soundbar which is the most common way that most, if not all Soundbars connect to a TV. HDMI IN 2 on the TV also supports HDMI ARC functionality so if a Soundbar also has an HDMI port that supports HDMI ARC functionality, you can connect it to the TV's ARC port...^IFV
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