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We have a smart 4K Samsung TV and just used one of the HDMI ports for the sound bar & it works great.
Sorry, there was a problem. Please try again later.I'm not familiar with AST HDMI, but this soundbar is labeled with HDMI ARC (audio return channel). I just plugged it in to the HDMI ARC Input on my TV with the included HDMI cable and was good to go. If you don't have an ARC labaled HDMI input, just plug into whatever available HDMI input along with plugging in the included optical audio cable!
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