“What is the USB connection used for on the sound bar...? Is the Tv USB connection supposed to connect to the sound bar USB... if yes, what function will it provide...?”
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Hello dvick56 - For the Samsung HW-450T soundbar you could use the HMDI to connect to the television HDMI ARC port so that the TV will see the sound bar as an extension of the TV - and your TV remote will control volume of the sound bar. ^Cris
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