We purchased a 55" Hisense A6 Series 4K Ultra HD TV (55U6GR). We immediately noticed the same issue so many have reported to ROKU and the community. The sound from the TV audio outputs do not sync with the TV speakers. We did research and find a great many folks reporting about a 100ms - 200ms delay in any attached sound device (sound bar, speakers, head set, etc.) Theres seems to be no way to correct this issue, and thus all we can only use in the tv speakers. This seems to be an issue with ROKU. We called the dealer, and were told that the sound sync issue is the most frequent complaint they hear about ROKU TVs. They gave us 30 days to return. The on board speakers, as has been reported, appear to be the only audio in sync. The headset output, the ARC HDMI, the optical audio output, all are not in sync with the built in speakers, and thus there is a sync issue, and an echo. There does not appear to be a way to bring all audio outputs into sync. This also appears to be well reported, and a very common issue with ROKU tvs. Before we take up the return offer from the dealer, we are wondering if ROKU is doing anything to correct this issue? Why is this a ROKU issue in the first place? Thank you.
