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We have an older surround sound Bose system and have the same problem. Connected it using an optical cable.
Sorry, there was a problem. Please try again later.It may be possible to connect via the headphone jack of the TV to the RCA "Audio Line-in" with a 3.5mm to RCA splitter cable. However, it is recommended to use a receiver or soundbar with digital inputs like Optical or HDMI Arc for the best experience and optimal compatibility. Hope this helps! Thank you, TCL Customer Support
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