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I don’t have the LG sound bar but I think the two connections are both for input to the sound bar so you can connect with either optical or mini rca so if one or the other is not present on your tv output. If you are going thru a sound system then it’s a whole different setup.
Sorry, there was a problem. Please try again later.Hi! This issue could be caused by different things like the type of jacks on the soundbar or TV, the cables or settings. This is why, I would like to suggest that you contact us on the link below, so we can gather more information and be able to help you with this matter. Viridiana E. Insignia Support. https://www.insigniaproducts.com/contact-us
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