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There is really no way to determine if there will be any delay when using an LG Soundbar, or any other Soundbar for that matter, with the LG UK6570PUB 4K HDR Smart LED UHD TV w/ AI ThinQ® - 75" Class (74.5" Diag), Model # 75UK6570PUB ( Link for the inquiry is showing an incorrect model number) because there are many causes for the delay and if the problem is in the program you're watching, there isn't much you can do about it. Getting a Sound Bar that has a function that can sync the audio might help. The TV itself has an AV Sync Adjustment feature that adjusts the synchronization of the sound from the speaker that is working. The closer to (+), the slower the audio output. You can also select Bypass so that it outputs broadcast signals or the sound from external devices without any audio delay. The audio is output before the video due to the time the TV takes to process the video input...^IFV
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