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Thank you for your inquiry! To connect your Denon surround sound receiver to your Insignia™ 75" Class F50 Series LED 4K UHD Smart Fire TV using HDMI ARC, first ensure both your TV and Denon receiver support HDMI ARC. Connect the HDMI cable to the HDMI ARC port on both devices. Next, enable HDMI-CEC and ARC on both devices. On your TV, go to Settings > Display & Sounds > HDMI CEC Device Control and enable it. On your Denon receiver, go to Settings > Video > HDMI Setup and enable HDMI Control and ARC. Then, select the input source as TV Audio on your Denon receiver. On your TV, go to Settings > Display & Sounds > Audio Output and select ARC. If you still don't get sound, ensure the HDMI cable is securely connected and of good quality, power off both the TV and receiver, then power them back on, or perform a factory reset on both devices as a last resort. Additionally, the Insignia™ 75" Class F50 Series LED 4K UHD Smart Fire TV has an optical audio output, so you can use an optical cable to connect your TV to the Denon receiver if the HDMI ARC setup doesn't work. If you have further questions, please feel free to reach us via phone 1-877-467-4289 Monday-Saturday 8 a.m. to 9 p.m. CT or email us at [email protected]. Keith | Insignia Support https://www.bestbuy.com/site/insignia-75-class-f50-series-led-4k-uhd-smart-fire-tv/6580447.p?skuId=6580447
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