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Pretty sure the SAMSUNG QN90B has a digital optical audio output. If it does, an optical audio to RCA converter will be your best option.
Sorry, there was a problem. Please try again later.Hello GOOBEE, To get sounds, use the RCA to HDMI set up since your Polk Audio Soundbar uses RCA jacks. For more questions and product support you may contact our customer service at 1-(877)-467-4289 Monday to Saturday 8am - 9pm CST. Chelsea Insignia Support Please give us a visit at: https://www.bestbuy.com/site/brands/best-buy-brands/pcmcat1596746025285.c?id=pcmcat1596746025285
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