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Samsung's new Q990D soundbar has HDMI 2.1 connectivity, allows for 4K 120Hz passthrough
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Soundbar with HDMI inputs / 4K passthrough | AVForums
SHARP HT-SBW460 3.1 Soundbar, 440W Dolby Atmos Soundbar with Subwoofer for TV with Wireless Bluetooth, Surround Sound, 4K Pass-Through, Aux, HDMI ARC /CEC & USB Playback, Table Top Sound Bar -Black: Amazon.co.uk:
Soundbar: What is HDMI Passthrough and how to set it up? – PRISM+